A321867 - cp's OEIS frontend

A321867 Numbers k such that 8k+1, 12k+1 and 24k+1 are primes and the last two are also of the form x^2 + 27y^2, so the tetrahedral number T(24k+1) is a Fermat pseudoprime to base 2.

n	a(n)
1	1179
2	1274
3	1895
4	4775
5	5304
6	5874
7	6525
8	6639
9	13035
10	16380
11	17424
12	18459
13	21239
14	21584
15	21714
16	22475
17	22715
18	22734
19	27410
20	28304
21	29340
22	29909
23	31755
24	32294
25	34700
26	37700
27	41525
28	42164
29	42929
30	42950
31	43275
32	46415
33	47174
34	47300
35	53364
36	57879
37	59739
38	61194

[1179, 1274, 1895, 4775, 5304, 5874, 6525, 6639, 13035, 16380, 17424, 18459, 21239, 21584, 21714, 22475, 22715, 22734, 27410, 28304, 29340, 29909, 31755, 32294, 34700, 37700, 41525, 42164, 42929, 42950, 43275, 46415, 47174, 47300, 53364, 57879, 59739, 61194]

cp's OEIS Frontend

A321867 Numbers k such that 8k+1, 12k+1 and 24k+1 are primes and the last two are also of the form x^2 + 27y^2, so the tetrahedral number T(24k+1) is a Fermat pseudoprime to base 2.

Table of values

List of values