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 A045979 Bernoulli number B_{2n} has denominator 6. 42
 1, 7, 13, 17, 19, 31, 37, 43, 47, 49, 59, 61, 67, 71, 73, 79, 91, 97, 101, 103, 107, 109, 127, 133, 137, 139, 149, 151, 157, 163, 167, 169, 181, 193, 197, 199, 211, 217, 223, 227, 229, 241, 247, 257, 259, 263, 269, 271, 277, 283, 289 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS All primes in A053176 are in the sequence. If n is in the sequence, its factorization contains only primes in A053176. - Benoit Cloitre, Oct 19 2002 B(2n) has denominator 6 iff (n^2-1)*B(2n) is an integer. - Benoit Cloitre, Feb 15 2004 Subsequence of A156543. [Reinhard Zumkeller, Feb 10 2009] REFERENCES B. C. Berndt, Ramanujan's Notebooks Part IV, Springer-Verlag, see p. 76. LINKS T. D. Noe, Table of n, a(n) for n=1..1000 FORMULA a(n) seems to be asymptotic to c*n 5

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Last modified March 25 20:38 EDT 2019. Contains 321477 sequences. (Running on oeis4.)