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<?php function isPrime($num) { for ($i = 2; $i < $num; $i++) { if ($num % $i == 0) { return false; } } return true; } function firstAndLastDigitEqual($num, $digit) { return substr($num, 0, 1) == (string)$digit && substr($num, -1) == (string)$digit; } $foundPrimes = 0; for ($i = 1; true; $i++) { if (firstAndLastDigitEqual($i, 3) && isPrime($i)) { if (++$foundPrimes == 333) { echo $i; break; } } }
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 19
Branch analysis from position: 19
2 jumps found. (Code = 44) Position 1 = 20, Position 2 = 3
Branch analysis from position: 20
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 3
2 jumps found. (Code = 46) Position 1 = 8, Position 2 = 12
Branch analysis from position: 8
2 jumps found. (Code = 43) Position 1 = 13, Position 2 = 18
Branch analysis from position: 13
2 jumps found. (Code = 43) Position 1 = 16, Position 2 = 18
Branch analysis from position: 16
1 jumps found. (Code = 42) Position 1 = 20
Branch analysis from position: 20
Branch analysis from position: 18
2 jumps found. (Code = 44) Position 1 = 20, Position 2 = 3
Branch analysis from position: 20
Branch analysis from position: 3
Branch analysis from position: 18
Branch analysis from position: 12
filename:       /in/UiOFq
function name:  (null)
number of ops:  21
compiled vars:  !0 = $foundPrimes, !1 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   16     0  E >   ASSIGN                                                   !0, 0
   17     1        ASSIGN                                                   !1, 1
          2      > JMP                                                      ->19
   18     3    >   INIT_FCALL                                               'firstandlastdigitequal'
          4        SEND_VAR                                                 !1
          5        SEND_VAL                                                 3
          6        DO_FCALL                                      0  $4      
          7      > JMPZ_EX                                          ~5      $4, ->12
          8    >   INIT_FCALL                                               'isprime'
          9        SEND_VAR                                                 !1
         10        DO_FCALL                                      0  $6      
         11        BOOL                                             ~5      $6
         12    > > JMPZ                                                     ~5, ->18
   19    13    >   PRE_INC                                          ~7      !0
         14        IS_EQUAL                                                 ~7, 333
         15      > JMPZ                                                     ~8, ->18
   20    16    >   ECHO                                                     !1
   21    17      > JMP                                                      ->20
   17    18    >   PRE_INC                                                  !1
         19    > > JMPNZ                                                    <true>, ->3
   24    20    > > RETURN                                                   1

Function isprime:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 8
Branch analysis from position: 8
2 jumps found. (Code = 44) Position 1 = 10, Position 2 = 3
Branch analysis from position: 10
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 3
2 jumps found. (Code = 43) Position 1 = 6, Position 2 = 7
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 7
2 jumps found. (Code = 44) Position 1 = 10, Position 2 = 3
Branch analysis from position: 10
Branch analysis from position: 3
filename:       /in/UiOFq
function name:  isPrime
number of ops:  12
compiled vars:  !0 = $num, !1 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        ASSIGN                                                   !1, 2
          2      > JMP                                                      ->8
    5     3    >   MOD                                              ~3      !0, !1
          4        IS_EQUAL                                                 ~3, 0
          5      > JMPZ                                                     ~4, ->7
    6     6    > > RETURN                                                   <false>
    4     7    >   PRE_INC                                                  !1
          8    >   IS_SMALLER                                               !1, !0
          9      > JMPNZ                                                    ~6, ->3
    9    10    > > RETURN                                                   <true>
   10    11*     > RETURN                                                   null

End of function isprime

Function firstandlastdigitequal:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 46) Position 1 = 10, Position 2 = 17
Branch analysis from position: 10
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 17
filename:       /in/UiOFq
function name:  firstAndLastDigitEqual
number of ops:  19
compiled vars:  !0 = $num, !1 = $digit
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   12     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   13     2        INIT_FCALL                                               'substr'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 0
          5        SEND_VAL                                                 1
          6        DO_ICALL                                         $2      
          7        CAST                                          6  ~3      !1
          8        IS_EQUAL                                         ~4      $2, ~3
          9      > JMPZ_EX                                          ~4      ~4, ->17
         10    >   INIT_FCALL                                               'substr'
         11        SEND_VAR                                                 !0
         12        SEND_VAL                                                 -1
         13        DO_ICALL                                         $5      
         14        CAST                                          6  ~6      !1
         15        IS_EQUAL                                         ~7      $5, ~6
         16        BOOL                                             ~4      ~7
         17    > > RETURN                                                   ~4
   14    18*     > RETURN                                                   null

End of function firstandlastdigitequal

Generated using Vulcan Logic Dumper, using php 8.0.0


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161.21 ms | 1403 KiB | 17 Q