A234143 - cp's OEIS frontend

A234143 Numbers k such that triangular(k) - x and y - triangular(k) are both triangular numbers (A000217), where x is the nearest square below triangular(k), y is the nearest square above triangular(k).

n	a(n)
1	1
2	4
3	5
4	19
5	22
6	25
7	40
8	64
9	85
10	89
11	110
12	124
13	127
14	148
15	263
16	552
17	688
18	700
19	705
20	790
21	1804
22	2101
23	4009
24	4108
25	8680
26	11830
27	15889
28	22125
29	23611
30	23710
31	27571
32	32902
33	34536
34	39520
35	47327
36	62329
37	68374
38	98896
39	100933
40	112660
41	137614
42	137989
43	138191
44	159124
45	205004

[1, 4, 5, 19, 22, 25, 40, 64, 85, 89, 110, 124, 127, 148, 263, 552, 688, 700, 705, 790, 1804, 2101, 4009, 4108, 8680, 11830, 15889, 22125, 23611, 23710, 27571, 32902, 34536, 39520, 47327, 62329, 68374, 98896, 100933, 112660, 137614, 137989, 138191, 159124, 205004]

cp's OEIS Frontend

A234143 Numbers k such that triangular(k) - x and y - triangular(k) are both triangular numbers (A000217), where x is the nearest square below triangular(k), y is the nearest square above triangular(k).

Table of values

List of values