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 A092681 Least number 2k such that p^2 divides the numerator of the Bernoulli number B(2k), where p is the n-th irregular prime, A000928(n). 4
 284, 914, 3292, 5768, 228, 12112, 11082, 6302, 11498, 40220, 34724, 51976, 1434, 74750, 67316, 21508, 63532, 39378, 67066, 64012, 91576, 137766, 137552, 105582, 158838, 147660, 175758, 194776, 173842, 102148, 132072, 107112, 127736, 29248 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The ordered-pair (p(n),a(n)), where p(n) is the n-th irregular prime, is called a second-order irregular pair. Some irregular primes, such as 157, have more than one pair. See A091887 for a count of the pairs for each irregular prime. LINKS Table of n, a(n) for n=1..34. Bernd Kellner, On irregular pairs of higher order (in German) CROSSREFS Cf. A000928, A035112, A091887, A092682. Sequence in context: A061310 A333930 A259996 * A090789 A234970 A260087 Adjacent sequences: A092678 A092679 A092680 * A092682 A092683 A092684 KEYWORD nonn AUTHOR T. D. Noe, Mar 03 2004 STATUS approved

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Last modified April 14 09:06 EDT 2024. Contains 371657 sequences. (Running on oeis4.)