A331753 - cp's OEIS frontend

A331753 Let m(k) be the index of the largest triangular number <= k; then a(n) is the smallest number k that can be written as the sum of three triangular numbers if the largest is the (m(k)-n)-th triangular number, but no larger.

n	a(n)
1	20
2	50
3	176
4	110
5	578
6	614
7	1163
8	1070
9	5135
10	9503
11	14648
12	7928
13	6035
14	18653
15	22130
16	119204
17	18128
18	68258
19	57335
20	304799
21	84725
22	1024532
23	215928
24	692858
25	688850
26	637853
27	736835
28	1406105
29	1801547
30	1987469
31	3673403
32	654155
33	8576861
34	808718
35	810146
36	21515948

[20, 50, 176, 110, 578, 614, 1163, 1070, 5135, 9503, 14648, 7928, 6035, 18653, 22130, 119204, 18128, 68258, 57335, 304799, 84725, 1024532, 215928, 692858, 688850, 637853, 736835, 1406105, 1801547, 1987469, 3673403, 654155, 8576861, 808718, 810146, 21515948]

cp's OEIS Frontend

A331753 Let m(k) be the index of the largest triangular number <= k; then a(n) is the smallest number k that can be written as the sum of three triangular numbers if the largest is the (m(k)-n)-th triangular number, but no larger.

Table of values

List of values