A260815 - cp's OEIS frontend

A260815 a(2) = 3; for n >= 3, a(n) = a(n-1) + gcd(n, a(n-1))^2.

n	a(n)
2	3
3	12
4	28
5	29
6	30
7	31
8	32
9	33
10	34
11	35
12	36
13	37
14	38
15	39
16	40
17	41
18	42
19	43
20	44
21	45
22	46
23	575
24	576
25	577
26	578
27	579
28	580
29	1421
30	1422
31	1423
32	1424
33	1425
34	1426
35	1427
36	1428
37	1429
38	1430
39	1599
40	1600
41	1601
42	1602
43	1603
44	1604
45	1605
46	1606
47	1607
48	1608
49	1609
50	1610
51	1611
52	1612

[3, 12, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 575, 576, 577, 578, 579, 580, 1421, 1422, 1423, 1424, 1425, 1426, 1427, 1428, 1429, 1430, 1599, 1600, 1601, 1602, 1603, 1604, 1605, 1606, 1607, 1608, 1609, 1610, 1611, 1612]

cp's OEIS Frontend

A260815 a(2) = 3; for n >= 3, a(n) = a(n-1) + gcd(n, a(n-1))^2.

Table of values

List of values