A005449 - cp's OEIS frontend

A005449 Second pentagonal numbers: a(n) = n(3n + 1)/2.

n	a(n)
0	0
1	2
2	7
3	15
4	26
5	40
6	57
7	77
8	100
9	126
10	155
11	187
12	222
13	260
14	301
15	345
16	392
17	442
18	495
19	551
20	610
21	672
22	737
23	805
24	876
25	950
26	1027
27	1107
28	1190
29	1276
30	1365
31	1457
32	1552
33	1650
34	1751
35	1855
36	1962
37	2072
38	2185
39	2301
40	2420
41	2542
42	2667
43	2795
44	2926
45	3060
46	3197
47	3337
48	3480

[0, 2, 7, 15, 26, 40, 57, 77, 100, 126, 155, 187, 222, 260, 301, 345, 392, 442, 495, 551, 610, 672, 737, 805, 876, 950, 1027, 1107, 1190, 1276, 1365, 1457, 1552, 1650, 1751, 1855, 1962, 2072, 2185, 2301, 2420, 2542, 2667, 2795, 2926, 3060, 3197, 3337, 3480]

cp's OEIS Frontend

A005449 Second pentagonal numbers: a(n) = n(3n + 1)/2.

Table of values

List of values

cp's OEIS Frontend

A005449 Second pentagonal numbers: a(n) = n*(3*n + 1)/2.

Table of values

List of values

A005449 Second pentagonal numbers: a(n) = n(3n + 1)/2.