A326727 - cp's OEIS frontend

A326727 The prime factorization of abs(numerator(B(2k))) for k >= 5, B(k) the k-th Bernoulli number. Factors sorted by size with the smallest factor negated. a(n) = -1 by convention for 1 <= n <= 5.

n	a(n)
1	-1
2	-1
3	-1
4	-1
5	-1
6	-5
7	-691
8	-7
9	-3617
10	-43867
11	-283
12	617
13	-11
14	131
15	593
16	-103
17	2294797
18	-13
19	657931
20	-7
21	9349
22	362903
23	-5
24	1721
25	1001259881
26	-37
27	683
28	305065927
29	-17
30	151628697551
31	-26315271553053477373
32	-19
33	154210205991661
34	-137616929
35	1897170067619

[-1, -1, -1, -1, -1, -5, -691, -7, -3617, -43867, -283, 617, -11, 131, 593, -103, 2294797, -13, 657931, -7, 9349, 362903, -5, 1721, 1001259881, -37, 683, 305065927, -17, 151628697551, -26315271553053477373, -19, 154210205991661, -137616929, 1897170067619]

cp's OEIS Frontend

A326727 The prime factorization of abs(numerator(B(2k))) for k >= 5, B(k) the k-th Bernoulli number. Factors sorted by size with the smallest factor negated. a(n) = -1 by convention for 1 <= n <= 5.

Table of values

List of values