A172437 - cp's OEIS frontend

A172437 Indices of pentagonal pyramidal numbers which are the sum of two other such numbers: k such that A002411(k) = A002411(i)+A002411(j) for some i,j>0.

n	a(n)
1	42
2	82
3	171
4	411
5	522
6	886
7	1042
8	1066
9	1183
10	1341
11	2596
12	2842
13	3480
14	3831
15	5012
16	5316
17	5360
18	5786
19	6219
20	6650
21	6924
22	8406
23	8666
24	9408
25	10707
26	11735
27	12590
28	12891
29	14422
30	14646
31	14826
32	17351
33	17702
34	17757
35	18882
36	23210
37	24108
38	25127
39	28175
40	31980
41	32400

[42, 82, 171, 411, 522, 886, 1042, 1066, 1183, 1341, 2596, 2842, 3480, 3831, 5012, 5316, 5360, 5786, 6219, 6650, 6924, 8406, 8666, 9408, 10707, 11735, 12590, 12891, 14422, 14646, 14826, 17351, 17702, 17757, 18882, 23210, 24108, 25127, 28175, 31980, 32400]

cp's OEIS Frontend

A172437 Indices of pentagonal pyramidal numbers which are the sum of two other such numbers: k such that A002411(k) = A002411(i)+A002411(j) for some i,j>0.

Table of values

List of values