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 A333414 #15 Mar 23 2020 11:58:33 %S A333414 1,19,35,115,44095,211117,14376053,43472060395,561558718915, %T A333414 2182879071661 %N A333414 Positive integers k such that k divides 17^k + 2. %C A333414 a(8) > 10^10. %C A333414 a(11) > 4*10^12. - _Giovanni Resta_, Mar 22 2020 %o A333414 (PARI) for(k=1, 1e6, if(Mod(17, k)^k==-2, print1(k", "))) %Y A333414 Solutions to b^n == -2 (mod n): A015973 (b=3), A123062 (b=5), A277370 (b=7), A333413 (b=13), this sequence (b=17). %Y A333414 Cf. A333269. %K A333414 nonn,more %O A333414 1,2 %A A333414 _Seiichi Manyama_, Mar 20 2020 %E A333414 a(8)-a(10) from _Giovanni Resta_, Mar 22 2020