A353001 - cp's OEIS frontend

A353001 Numbers k such that the k-th triangular number mod the sum (with multiplicity) of prime factors of k, and the k-th triangular number mod the sum of divisors of k, are both prime.

n	a(n)
1	4
2	57
3	70
4	93
5	129
6	217
7	322
8	381
9	417
10	453
11	513
12	565
13	597
14	646
15	682
16	781
17	813
18	921
19	925
20	1057
21	1081
22	1102
23	1137
24	1165
25	1197
26	1261
27	1317
28	1393
29	1405
30	1558
31	1582
32	1641
33	1750
34	1798
35	1846
36	1857
37	1918
38	1929
39	2073
40	2101
41	2110
42	2173
43	2181
44	2305
45	2329
46	2361
47	2482
48	2506
49	2569
50	2577
51	2626
52	2649
53	2653

[4, 57, 70, 93, 129, 217, 322, 381, 417, 453, 513, 565, 597, 646, 682, 781, 813, 921, 925, 1057, 1081, 1102, 1137, 1165, 1197, 1261, 1317, 1393, 1405, 1558, 1582, 1641, 1750, 1798, 1846, 1857, 1918, 1929, 2073, 2101, 2110, 2173, 2181, 2305, 2329, 2361, 2482, 2506, 2569, 2577, 2626, 2649, 2653]

cp's OEIS Frontend

A353001 Numbers k such that the k-th triangular number mod the sum (with multiplicity) of prime factors of k, and the k-th triangular number mod the sum of divisors of k, are both prime.

Table of values

List of values