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 A299205 #27 Feb 16 2025 08:33:53 %S A299205 2,3,10,14,15,56,57,59,70,85,105,107,116,136,209,267,295,323,352,393, %T A299205 415,442,530,551,645,646,760,855,1197,1288,1342,1415,1472,1496,1625, %U A299205 1765,1953,2002,2255,2485,2847,2945,3039,3382,3591,3745,3905,4233,4264,4313 %N A299205 Numbers k such that k-1 divides tau(k), where tau(k) = A000594(k) is Ramanujan's tau function. %C A299205 Numbers k such that A299204(k) = 0. %H A299205 Seiichi Manyama, <a href="/A299205/b299205.txt">Table of n, a(n) for n = 1..500</a> %H A299205 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TauFunction.html">Tau Function</a>. %t A299205 Select[Range[2, 5000], Divisible[RamanujanTau[#], #-1] &] (* _Amiram Eldar_, Jan 10 2025 *) %o A299205 (PARI) isok(n) = (ramanujantau(n) % (n-1)) == 0; \\ _Michel Marcus_, Feb 05 2018 %Y A299205 For the sequence when n is prime see A299172. %Y A299205 Cf. A000594, A063938, A299157, A299204. %K A299205 nonn %O A299205 1,1 %A A299205 _Seiichi Manyama_, Feb 05 2018