A112561 - cp's OEIS frontend

A112561 Sieve performed by successive iterations of steps where step m is: keep m terms, remove the next 3 and repeat; as m = 1,2,3,.. the remaining terms form this sequence.

n	a(n)
0	1
1	5
2	21
3	61
4	125
5	261
6	421
7	605
8	1101
9	1681
10	2525
11	2781
12	4201
13	5645
14	6741
15	9541
16	11765
17	13701
18	17641
19	21305
20	27981
21	29401
22	37265
23	43521
24	51541
25	59945
26	65781
27	78121
28	89345
29	99981
30	121381
31	124445
32	144321
33	173041
34	189965
35	212361
36	229381

[1, 5, 21, 61, 125, 261, 421, 605, 1101, 1681, 2525, 2781, 4201, 5645, 6741, 9541, 11765, 13701, 17641, 21305, 27981, 29401, 37265, 43521, 51541, 59945, 65781, 78121, 89345, 99981, 121381, 124445, 144321, 173041, 189965, 212361, 229381]

cp's OEIS Frontend

A112561 Sieve performed by successive iterations of steps where step m is: keep m terms, remove the next 3 and repeat; as m = 1,2,3,.. the remaining terms form this sequence.

Table of values

List of values