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 A128197 #17 Jul 18 2025 04:06:11 %S A128197 67,101,149,263,307,311,353,379,433,461,463,491,541,577,587,619,677, %T A128197 691,751,761,773,811,821,877,887,929,971,1151,1229,1279,1283,1291, %U A128197 1307,1319,1381,1409,1429,1439,1523,1559,1621,1637,1663,1733,1759,1787,1831,1877 %N A128197 Strong irregular primes. A prime is strong irregular iff it is a Bernoulli irregular prime and an Euler irregular prime. %H A128197 Amiram Eldar, <a href="/A128197/b128197.txt">Table of n, a(n) for n = 1..424</a> %H A128197 Bernd C. Kellner, <a href="http://dx.doi.org/10.1090/S0025-5718-06-01887-4"> On irregular prime power divisors of the Bernoulli numbers</a>, Math. Comp. 76 (2007) 405-441. %H A128197 Peter Luschny, <a href="http://www.luschny.de/math/primes/irregular.html">Irregular Bernoulli and Euler Primes</a>. %H A128197 The Prime Pages, <a href="https://t5k.org/top20/page.php?id=25">Euler Irregular Primes</a>. %H A128197 The Prime Pages, <a href="https://t5k.org/top20/page.php?id=26">Irregular Primes</a>. %Y A128197 Cf. A000040, A000928, A120337. %K A128197 hard,nonn %O A128197 1,1 %A A128197 _Peter Luschny_, Feb 27 2007