A280028 - cp's OEIS frontend

A280028 a(1)=1; thereafter, if n even, a(n) = a(n-1)-st prime, and if n odd, a(n) = a(n-1)-st nonprime.

n	a(n)
1	1
2	2
3	4
4	7
5	12
6	37
7	52
8	239
9	301
10	1993
11	2338
12	20753
13	23356
14	266587
15	291968
16	4134187
17	4446630
18	75947059
19	80652283
20	1625456353
21	1710094788
22	39954587527
23	41737658509
24	1114336791787
25	1157634258442
26	34900173534517
27	36096139358620
28	1216553712004063

[1, 2, 4, 7, 12, 37, 52, 239, 301, 1993, 2338, 20753, 23356, 266587, 291968, 4134187, 4446630, 75947059, 80652283, 1625456353, 1710094788, 39954587527, 41737658509, 1114336791787, 1157634258442, 34900173534517, 36096139358620, 1216553712004063]

cp's OEIS Frontend

A280028 a(1)=1; thereafter, if n even, a(n) = a(n-1)-st prime, and if n odd, a(n) = a(n-1)-st nonprime.

Table of values

List of values