A064961 - cp's OEIS frontend

A064961 Composite-then-prime recurrence; a(2n) = a(2n-1)-th composite and a(2n+1) = a(2n)-th prime and a(1) = 1.

n	a(n)
1	1
2	4
3	7
4	14
5	43
6	62
7	293
8	366
9	2473
10	2892
11	26317
12	29522
13	344249
14	376259
15	5429539
16	5831545
17	101291779
18	107457490
19	2198218819
20	2310909505
21	54720307351
22	57128530327
23	1543908890351
24	1603146693999
25	48871886538151
26	50527531769529
27	1720466016680911
28	1772475453490311

[1, 4, 7, 14, 43, 62, 293, 366, 2473, 2892, 26317, 29522, 344249, 376259, 5429539, 5831545, 101291779, 107457490, 2198218819, 2310909505, 54720307351, 57128530327, 1543908890351, 1603146693999, 48871886538151, 50527531769529, 1720466016680911, 1772475453490311]

cp's OEIS Frontend

A064961 Composite-then-prime recurrence; a(2n) = a(2n-1)-th composite and a(2n+1) = a(2n)-th prime and a(1) = 1.

Table of values

List of values