A255677 - cp's OEIS frontend

A255677 Least integer k > 1 such that pi(k)^2 + pi(k*n)^2 is a square, where pi(.) is the prime-counting function given by A000720.

n	a(n)
2	5
3	30
4	8458
5	18
6	252
7	25
8	1407
9	476
10	9098
11	108
12	1814
13	1868
14	153
15	1005
16	67
17	26532
18	1592
19	200
20	963
21	99
22	833
23	1356
24	3869
25	981
26	531
27	127
28	4961
29	366
30	1192
31	1873
32	41308
33	409
34	21756
35	194664
36	180
37	27071
38	7433
39	160179
40	2076
41	544
42	211
43	10639
44	19571
45	33483
46	603
47	68380
48	1517
49	47529
50	35923

[5, 30, 8458, 18, 252, 25, 1407, 476, 9098, 108, 1814, 1868, 153, 1005, 67, 26532, 1592, 200, 963, 99, 833, 1356, 3869, 981, 531, 127, 4961, 366, 1192, 1873, 41308, 409, 21756, 194664, 180, 27071, 7433, 160179, 2076, 544, 211, 10639, 19571, 33483, 603, 68380, 1517, 47529, 35923]

cp's OEIS Frontend

A255677 Least integer k > 1 such that pi(k)^2 + pi(k*n)^2 is a square, where pi(.) is the prime-counting function given by A000720.

Table of values

List of values