A132273 - cp's OEIS frontend

A132273 a(n) = Sum{k=1..n} (k-th integer from among those positive integers that are coprime to (n+1-k)).

n	a(n)
1	1
2	3
3	7
4	12
5	20
6	28
7	41
8	52
9	69
10	83
11	103
12	122
13	149
14	169
15	197
16	222
17	257
18	285
19	322
20	355
21	397
22	431
23	477
24	514
25	567
26	610
27	662
28	708
29	769
30	815
31	882
32	935
33	1000
34	1056
35	1123
36	1182
37	1267
38	1326
39	1404
40	1471
41	1554
42	1628
43	1712
44	1790
45	1882
46	1958
47	2057
48	2137
49	2240

[1, 3, 7, 12, 20, 28, 41, 52, 69, 83, 103, 122, 149, 169, 197, 222, 257, 285, 322, 355, 397, 431, 477, 514, 567, 610, 662, 708, 769, 815, 882, 935, 1000, 1056, 1123, 1182, 1267, 1326, 1404, 1471, 1554, 1628, 1712, 1790, 1882, 1958, 2057, 2137, 2240]

cp's OEIS Frontend

A132273 a(n) = Sum{k=1..n} (k-th integer from among those positive integers that are coprime to (n+1-k)).

Table of values

List of values