A371759 - cp's OEIS frontend

A371759 a(n) is the smallest n-gonal number that is a Fermat pseudoprime to base 2 (A001567), or -1 if no such number exists.

n	a(n)
3	561
4	1194649
5	7957
6	561
7	23377
8	341
9	129889
10	1105
11	35333
12	561
13	204001
14	31609
15	2940337
16	1105
17	493697
18	8481
19	13981
20	1905
21	88561
22	41665
23	10680265
24	1729
25	107185
26	264773
27	449065
28	6601
29	2165801
30	23001
31	1141141
32	13981
33	272251
34	4369
35	17590957
36	15841
37	137149
38	2821
39	561

[561, 1194649, 7957, 561, 23377, 341, 129889, 1105, 35333, 561, 204001, 31609, 2940337, 1105, 493697, 8481, 13981, 1905, 88561, 41665, 10680265, 1729, 107185, 264773, 449065, 6601, 2165801, 23001, 1141141, 13981, 272251, 4369, 17590957, 15841, 137149, 2821, 561]

cp's OEIS Frontend

A371759 a(n) is the smallest n-gonal number that is a Fermat pseudoprime to base 2 (A001567), or -1 if no such number exists.

Table of values

List of values