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<?php $i = 1; for($f = 0; $f <= 20; $f++) { echo "F".$f." = ".intval((($f*$f-1)+$f*$f-2))."\n"; $i++; }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
F0 = -3 F1 = -1 F2 = 5 F3 = 15 F4 = 29 F5 = 47 F6 = 69 F7 = 95 F8 = 125 F9 = 159 F10 = 197 F11 = 239 F12 = 285 F13 = 335 F14 = 389 F15 = 447 F16 = 509 F17 = 575 F18 = 645 F19 = 719 F20 = 797
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 F0 = -3 F1 = -1 F2 = 5 F3 = 15 F4 = 29 F5 = 47 F6 = 69 F7 = 95 F8 = 125 F9 = 159 F10 = 197 F11 = 239 F12 = 285 F13 = 335 F14 = 389 F15 = 447 F16 = 509 F17 = 575 F18 = 645 F19 = 719 F20 = 797

preferences:
200.58 ms | 402 KiB | 311 Q