A132275 - cp's OEIS frontend

A132275 a(1)=1. a(n+1) = sum{k=1 to n} (a(k)th integer from among those positive integers which are coprime to a(n+1-k)).

n	a(n)
1	1
2	1
3	2
4	4
5	8
6	17
7	37
8	81
9	177
10	387
11	847
12	1856
13	4066
14	8910
15	19524
16	42783
17	93760
18	205475
19	450282
20	986770
21	2162473
22	4738974
23	10385267
24	22758885
25	49875175
26	109299427
27	239525260
28	524909877
29	1150318695
30	2520876742
31	5524399079
32	12106496388
33	26530895539
34	58141380910

[1, 1, 2, 4, 8, 17, 37, 81, 177, 387, 847, 1856, 4066, 8910, 19524, 42783, 93760, 205475, 450282, 986770, 2162473, 4738974, 10385267, 22758885, 49875175, 109299427, 239525260, 524909877, 1150318695, 2520876742, 5524399079, 12106496388, 26530895539, 58141380910]

cp's OEIS Frontend

A132275 a(1)=1. a(n+1) = sum{k=1 to n} (a(k)th integer from among those positive integers which are coprime to a(n+1-k)).

Table of values

List of values