A216646 - cp's OEIS frontend

A216646 a(n) = 1+2(d1 + 1)(d2 + 1)* … *(dk + 1), where d1, d2, ..., dk are the prime factors of the n-th Fermat pseudoprime to base 2 A001567(n).

n	a(n)
1	769
2	1729
3	2113
4	3025
5	2961
6	4481
7	6145
8	4321
9	6481
10	5625
11	7169
12	6841
13	8361
14	9289
15	12289
16	9729
17	11265
18	16129
19	16281
20	17065
21	24769
22	21761
23	21249
24	26641
25	34561
26	36289
27	34049
28	28081
29	32257
30	29745
31	32833
32	37889
33	43345
34	63361
35	38025
36	40609
37	72577
38	47433
39	71169

[769, 1729, 2113, 3025, 2961, 4481, 6145, 4321, 6481, 5625, 7169, 6841, 8361, 9289, 12289, 9729, 11265, 16129, 16281, 17065, 24769, 21761, 21249, 26641, 34561, 36289, 34049, 28081, 32257, 29745, 32833, 37889, 43345, 63361, 38025, 40609, 72577, 47433, 71169]

cp's OEIS Frontend

A216646 a(n) = 1+2(d1 + 1)(d2 + 1)* … *(dk + 1), where d1, d2, ..., dk are the prime factors of the n-th Fermat pseudoprime to base 2 A001567(n).

Table of values

List of values

cp's OEIS Frontend

A216646 a(n) = 1+2*(d1 + 1)*(d2 + 1)* … *(dk + 1), where d1, d2, ..., dk are the prime factors of the n-th Fermat pseudoprime to base 2 A001567(n).

Table of values

List of values

A216646 a(n) = 1+2(d1 + 1)(d2 + 1)* … *(dk + 1), where d1, d2, ..., dk are the prime factors of the n-th Fermat pseudoprime to base 2 A001567(n).