This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A358207 #22 Dec 04 2022 16:33:14 %S A358207 0,1,2,3,8,13,19,85,258,393,828,1811,2538,2916,2986,3627,4540,10503, %T A358207 140833,268865,298436,423437,902696,1050503,1845571,2491032,5513951, %U A358207 14365940,25809892,26237622,28559254,61875091,79094282,186062629,246553448,451977320,452357920,620208559,813448358,849937635 %N A358207 Numbers k such that k^2 + 2 is a palindrome. %o A358207 (PARI) isok(k) = my(d=digits(k^2+2)); d == Vecrev(d); \\ _Michel Marcus_, Nov 04 2022 %Y A358207 Cf. A358237, A059100, A027719, A002778, A070253. %K A358207 nonn,base %O A358207 1,3 %A A358207 _Robert Xiao_, Nov 04 2022