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 A128397 #14 May 21 2024 01:14:24 %S A128397 1,2,4,6,8,12,16,18,20,24,36,40,42,48,60,72,78,80,84,116,120,126,144, %T A128397 156,168,180,220,232,234,240,252,312,336,342,348,360,420,440,464,468, %U A128397 504,546,580,624,660,684,696,720,780,840,880,936,1008,1044,1092,1160 %N A128397 Numbers k such that k^2 divides 17^k-1. %C A128397 The first 9 numbers (and many more) which are a multiple of their digital sum in all bases from 2 through 16 (A218087), are members of this sequence, and also of A177917. - _M. F. Hasler_, Oct 22 2012 %H A128397 Amiram Eldar, <a href="/A128397/b128397.txt">Table of n, a(n) for n = 1..10000</a> %o A128397 (PARI) is_A128397(n)=Mod(17,n^2)^n==1 \\ _M. F. Hasler_, Oct 22 2012 %Y A128397 Cf. A127103, A127104, A127105, A127106, A127107, A127102, A127101, A127100, A127092, A128405, A128393, A128394, A128395, A128396, A128398, A128399, A128400, A128401, A128402, A128403, A128404. %Y A128397 Cf. A177917. %K A128397 nonn,less %O A128397 1,2 %A A128397 _Alexander Adamchuk_, Mar 01 2007