A191290 - cp's OEIS frontend

A191290 Increasing sequence generated by these rules: a(1)=1, and if x is in a then 2x+1 and x(x+1)/2 are in a.

n	a(n)
1	1
2	3
3	6
4	7
5	13
6	15
7	21
8	27
9	28
10	31
11	43
12	55
13	57
14	63
15	87
16	91
17	111
18	115
19	120
20	127
21	175
22	183
23	223
24	231
25	241
26	255
27	351
28	367
29	378
30	406
31	447
32	463
33	483
34	496
35	511
36	703
37	735
38	757
39	813
40	895
41	927
42	946
43	967
44	993
45	1023
46	1407
47	1471
48	1515
49	1540
50	1627
51	1653
52	1791
53	1855
54	1893
55	1935
56	1987
57	2016
58	2047
59	2815
60	2943
61	3031
62	3081
63	3255
64	3307
65	3583

[1, 3, 6, 7, 13, 15, 21, 27, 28, 31, 43, 55, 57, 63, 87, 91, 111, 115, 120, 127, 175, 183, 223, 231, 241, 255, 351, 367, 378, 406, 447, 463, 483, 496, 511, 703, 735, 757, 813, 895, 927, 946, 967, 993, 1023, 1407, 1471, 1515, 1540, 1627, 1653, 1791, 1855, 1893, 1935, 1987, 2016, 2047, 2815, 2943, 3031, 3081, 3255, 3307, 3583]

cp's OEIS Frontend

A191290 Increasing sequence generated by these rules: a(1)=1, and if x is in a then 2x+1 and x(x+1)/2 are in a.

Table of values

List of values