A326726 - cp's OEIS frontend

A326726 The prime factorization of abs(E(2k)) for k >= 2, E(k) the k-th Euler number. Factors sorted by size with the smallest factor negated. a(n) = -1 by convention for n = 1, 2.

n	a(n)
1	-1
2	-1
3	-5
4	-61
5	-5
6	277
7	-19
8	2659
9	-5
10	13
11	43
12	967
13	-47
14	4241723
15	-5
16	17
17	228135437
18	-79
19	349
20	87224971
21	-5
22	5
23	41737
24	354957173
25	-31
26	1567103
27	1427513357
28	-5
29	13
30	2137
31	111691689741601
32	-67
33	61001082228255580483
34	-5
35	19
36	29
37	71
38	30211
39	2717447
40	77980901

[-1, -1, -5, -61, -5, 277, -19, 2659, -5, 13, 43, 967, -47, 4241723, -5, 17, 228135437, -79, 349, 87224971, -5, 5, 41737, 354957173, -31, 1567103, 1427513357, -5, 13, 2137, 111691689741601, -67, 61001082228255580483, -5, 19, 29, 71, 30211, 2717447, 77980901]

cp's OEIS Frontend

A326726 The prime factorization of abs(E(2k)) for k >= 2, E(k) the k-th Euler number. Factors sorted by size with the smallest factor negated. a(n) = -1 by convention for n = 1, 2.

Table of values

List of values