A280029 - cp's OEIS frontend

A280029 a(1)=3; thereafter, if n odd, a(n) = a(n-1)-st prime, and if n even, a(n) = a(n-1)-st nonprime.

n	a(n)
1	3
2	6
3	13
4	21
5	73
6	98
7	521
8	636
9	4721
10	5439
11	53323
12	59318
13	737183
14	801235
15	12215237
16	13068626
17	238205651
18	251987681
19	5381022817
20	5644769560
21	138933578143
22	144807081479
23	4053430178401
24	4203399920996
25	132332669898119
26	136669373292795
27	4793783797371011

[3, 6, 13, 21, 73, 98, 521, 636, 4721, 5439, 53323, 59318, 737183, 801235, 12215237, 13068626, 238205651, 251987681, 5381022817, 5644769560, 138933578143, 144807081479, 4053430178401, 4203399920996, 132332669898119, 136669373292795, 4793783797371011]

cp's OEIS Frontend

A280029 a(1)=3; thereafter, if n odd, a(n) = a(n-1)-st prime, and if n even, a(n) = a(n-1)-st nonprime.

Table of values

List of values