A355697 - cp's OEIS frontend

A355697 a(0) = 0, a(1) = 1; for n > 1, a(n) = a(n-1) + g - 1 if a(n-1) is prime, otherwise a(n) = a(n-1) + g + 1, where g = a(n-1) - a(n-2).

n	a(n)
0	0
1	1
2	3
3	4
4	6
5	9
6	13
7	16
8	20
9	25
10	31
11	36
12	42
13	49
14	57
15	66
16	76
17	87
18	99
19	112
20	126
21	141
22	157
23	172
24	188
25	205
26	223
27	240
28	258
29	277
30	295
31	314
32	334
33	355
34	377
35	400
36	424
37	449
38	473
39	498
40	524
41	551
42	579
43	608
44	638
45	669
46	701
47	732
48	764
49	797
50	829
51	860
52	892
53	925
54	959
55	994
56	1030
57	1067
58	1105
59	1144
60	1184

[0, 1, 3, 4, 6, 9, 13, 16, 20, 25, 31, 36, 42, 49, 57, 66, 76, 87, 99, 112, 126, 141, 157, 172, 188, 205, 223, 240, 258, 277, 295, 314, 334, 355, 377, 400, 424, 449, 473, 498, 524, 551, 579, 608, 638, 669, 701, 732, 764, 797, 829, 860, 892, 925, 959, 994, 1030, 1067, 1105, 1144, 1184]

cp's OEIS Frontend

A355697 a(0) = 0, a(1) = 1; for n > 1, a(n) = a(n-1) + g - 1 if a(n-1) is prime, otherwise a(n) = a(n-1) + g + 1, where g = a(n-1) - a(n-2).

Table of values

List of values