A003508 - cp's OEIS frontend

A003508 a(1) = 1; for n>1, a(n) = a(n-1) + 1 + sum of distinct prime factors of a(n-1) that are < a(n-1).

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	8
7	11
8	12
9	18
10	24
11	30
12	41
13	42
14	55
15	72
16	78
17	97
18	98
19	108
20	114
21	139
22	140
23	155
24	192
25	198
26	215
27	264
28	281
29	282
30	335
31	408
32	431
33	432
34	438
35	517
36	576
37	582
38	685
39	828
40	857
41	858
42	888
43	931
44	958
45	1440
46	1451
47	1452
48	1469
49	1596
50	1628
51	1679
52	1776
53	1819
54	1944

[1, 2, 3, 4, 7, 8, 11, 12, 18, 24, 30, 41, 42, 55, 72, 78, 97, 98, 108, 114, 139, 140, 155, 192, 198, 215, 264, 281, 282, 335, 408, 431, 432, 438, 517, 576, 582, 685, 828, 857, 858, 888, 931, 958, 1440, 1451, 1452, 1469, 1596, 1628, 1679, 1776, 1819, 1944]

cp's OEIS Frontend

A003508 a(1) = 1; for n>1, a(n) = a(n-1) + 1 + sum of distinct prime factors of a(n-1) that are < a(n-1).

Table of values

List of values