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 A232039 Primes p congruent to 1 mod 12 such that (p + 1)/2 does not divide the numerator of the Bernoulli number B(p + 1). 1
 109, 769, 1429, 2089, 2161, 2749, 3541, 4729, 4969, 6577, 6709, 7369, 8689, 9349, 9613, 10009, 11329, 13309, 14629, 15289, 17029, 17929, 19249, 21757, 22549, 23209, 23869, 24793, 25189, 25849, 30469, 33769, 34429, 35089, 39709, 41077, 42349, 43669, 46309 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A prime p is in the sequence if p is of the form 660*n + 109. LINKS Table of n, a(n) for n=1..39. Index entries for sequences related to Bernoulli numbers EXAMPLE 109 is in the sequence because B(110) = (5 * 157 * 76493 * C)/1518 (where C is some large, unfactored composite number), the numerator of which is not divisible by 110/2 = 5 * 11. 97 is not in the sequence because B(98) = (7^2 * 2857 * 3221 * C)/6, the numerator of which is divisible by 98/2 = 49 = 7^2. MATHEMATICA Select[12Range[864] + 1, PrimeQ[#] && Not[Divisible[Numerator[Bernoulli[# + 1]], (# + 1)/2]] &] (* Alonso del Arte, Nov 17 2013 *) PROG (PARI) forstep(p=1, 46309, 12, if(isprime(p)&&!Mod(numerator(bernfrac(p+1)), (p+1)/2)==0, print1(p, ", "))); CROSSREFS Cf. A000367, A000928, A068228, A232040. Sequence in context: A226473 A142366 A103734 * A301743 A178263 A061699 Adjacent sequences: A232036 A232037 A232038 * A232040 A232041 A232042 KEYWORD nonn AUTHOR Arkadiusz Wesolowski, Nov 17 2013 STATUS approved

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Last modified December 4 18:06 EST 2023. Contains 367563 sequences. (Running on oeis4.)