A321985 - cp's OEIS frontend

A321985 Numbers m such that m^2+1 is semiprime with (m-1)^2+1 and (m+1)^2+1 primes.

n	a(n)
1	3
2	5
3	15
4	25
5	205
6	715
7	1095
8	1315
9	1615
10	2055
11	2405
12	2925
13	3755
14	4615
15	4795
16	5015
17	5055
18	5475
19	6785
20	7855
21	8115
22	8175
23	9425
24	9475
25	10415
26	10845
27	11025
28	11245
29	12335
30	12765
31	15225
32	16225
33	16395
34	16405
35	18145
36	18175
37	18275
38	21345
39	21915
40	22905
41	23165
42	23815

[3, 5, 15, 25, 205, 715, 1095, 1315, 1615, 2055, 2405, 2925, 3755, 4615, 4795, 5015, 5055, 5475, 6785, 7855, 8115, 8175, 9425, 9475, 10415, 10845, 11025, 11245, 12335, 12765, 15225, 16225, 16395, 16405, 18145, 18175, 18275, 21345, 21915, 22905, 23165, 23815]

cp's OEIS Frontend

A321985 Numbers m such that m^2+1 is semiprime with (m-1)^2+1 and (m+1)^2+1 primes.

Table of values

List of values