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 A177817 #8 Jun 06 2021 09:03:07 %S A177817 1,3,9,21,39,63,117,273,819,1467,2067,3081,4269,6201,7299,9243,10269, %T A177817 12807,14469,16959,19071,20421,21567,23877,29883,43407,48711,50877, %U A177817 51093,55497,64701,89649,94887,118713,133497,142947,146133,149331 %N A177817 Numbers k such that k^3 divides 17^(k^2) + 1. %C A177817 3 divides a(n) for n > 1. %Y A177817 Cf. A127263 (k^3 divides 2^(k^2) + 1). %Y A177817 Cf. A128678, A128679, A128680, A128681, A128682, A128683, A128684, A128685. %Y A177817 Cf. A177813, A177814, A177816, A177817, A177818, A177819, A177820. %Y A177817 Cf. A128677 (least k > p such that (k*p)^3 divides (p-1)^(k*p)^2+1, where p = prime(n) > 2). %K A177817 nonn %O A177817 1,2 %A A177817 _Alexander Adamchuk_, May 14 2010