A144521 - cp's OEIS frontend

A144521 Tetrahedral numbers k(k+1)(k+2)/6 such that exactly one of k, k+1, and k+2 is prime.

n	a(n)
1	0
2	20
3	56
4	84
5	165
6	220
7	364
8	455
9	680
10	816
11	1140
12	1330
13	1771
14	2024
15	2300
16	3654
17	4060
18	4960
19	5456
20	7770
21	8436
22	9139
23	10660
24	11480
25	13244
26	14190
27	16215
28	17296
29	18424
30	23426
31	24804
32	26235
33	32509
34	34220
35	37820
36	39711
37	47905
38	50116
39	52394
40	57155

[0, 20, 56, 84, 165, 220, 364, 455, 680, 816, 1140, 1330, 1771, 2024, 2300, 3654, 4060, 4960, 5456, 7770, 8436, 9139, 10660, 11480, 13244, 14190, 16215, 17296, 18424, 23426, 24804, 26235, 32509, 34220, 37820, 39711, 47905, 50116, 52394, 57155]

cp's OEIS Frontend

A144521 Tetrahedral numbers k(k+1)(k+2)/6 such that exactly one of k, k+1, and k+2 is prime.

Table of values

List of values

cp's OEIS Frontend

A144521 Tetrahedral numbers k*(k+1)*(k+2)/6 such that exactly one of k, k+1, and k+2 is prime.

Table of values

List of values

A144521 Tetrahedral numbers k(k+1)(k+2)/6 such that exactly one of k, k+1, and k+2 is prime.