A107757 - cp's OEIS frontend

A107757 Numbers k such that Sum_{j=1..k} Catalan(j) == 2 (mod 3).

n	a(n)
1	3
2	9
3	11
4	27
5	29
6	35
7	39
8	81
9	83
10	89
11	93
12	107
13	111
14	117
15	119
16	243
17	245
18	251
19	255
20	269
21	273
22	279
23	281
24	323
25	327
26	333
27	335
28	351
29	353
30	359
31	363
32	729
33	731
34	737
35	741
36	755
37	759
38	765
39	767
40	809
41	813
42	819
43	821
44	837
45	839
46	845
47	849
48	971
49	975
50	981
51	983
52	999
53	1001
54	1007
55	1011

[3, 9, 11, 27, 29, 35, 39, 81, 83, 89, 93, 107, 111, 117, 119, 243, 245, 251, 255, 269, 273, 279, 281, 323, 327, 333, 335, 351, 353, 359, 363, 729, 731, 737, 741, 755, 759, 765, 767, 809, 813, 819, 821, 837, 839, 845, 849, 971, 975, 981, 983, 999, 1001, 1007, 1011]

cp's OEIS Frontend

A107757 Numbers k such that Sum_{j=1..k} Catalan(j) == 2 (mod 3).

Table of values

List of values