A173446 - cp's OEIS frontend

A173446 ((n+{0,1})-th prime-1)^2+1 are both primes.

n	a(n)
1	1
2	2
3	3
4	4
5	12
6	31
7	36
8	53
9	54
10	78
11	82
12	105
13	125
14	155
15	247
16	403
17	422
18	548
19	678
20	679
21	751
22	769
23	784
24	798
25	809
26	829
27	845
28	899
29	1049
30	1148
31	1155
32	1312
33	1317
34	1423
35	1436
36	1490
37	1616
38	1688
39	1935
40	1961
41	1990
42	1991
43	2071
44	2181
45	2198
46	2397
47	2437
48	2454
49	2463
50	2556

[1, 2, 3, 4, 12, 31, 36, 53, 54, 78, 82, 105, 125, 155, 247, 403, 422, 548, 678, 679, 751, 769, 784, 798, 809, 829, 845, 899, 1049, 1148, 1155, 1312, 1317, 1423, 1436, 1490, 1616, 1688, 1935, 1961, 1990, 1991, 2071, 2181, 2198, 2397, 2437, 2454, 2463, 2556]

cp's OEIS Frontend

A173446 ((n+{0,1})-th prime-1)^2+1 are both primes.

Table of values

List of values