A103787 - cp's OEIS frontend

A103787 a(n) = number of k's that make primorial P(n)/A019565(k)+A019565(k) prime, A019565(k)^2<=P(n).

n	a(n)
1	1
2	2
3	4
4	8
5	12
6	21
7	40
8	70
9	117
10	263
11	450
12	703
13	1385
14	2423
15	5501
16	8617
17	18249
18	29352
19	61970
20	103568
21	209309
22	404977
23	853279
24	1609502
25	3008915
26	5342983
27	10287184
28	19087437
29	38498011
30	78520137
31	145642314

[1, 2, 4, 8, 12, 21, 40, 70, 117, 263, 450, 703, 1385, 2423, 5501, 8617, 18249, 29352, 61970, 103568, 209309, 404977, 853279, 1609502, 3008915, 5342983, 10287184, 19087437, 38498011, 78520137, 145642314]

cp's OEIS Frontend

A103787 a(n) = number of k's that make primorial P(n)/A019565(k)+A019565(k) prime, A019565(k)^2<=P(n).

Table of values

List of values