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A079463
Numbers k such that C(6*k,n)/(5*k+1) (A002295) is not divisible by 6.
1
0, 1, 3, 4, 5, 7, 13, 16, 19, 21, 22, 34, 40, 49, 51, 53, 67, 77, 83, 85, 97, 103, 115, 121, 148, 196, 202, 205, 211, 213, 292, 307, 309, 310, 333, 339, 340, 341, 346, 358, 364, 439, 445, 583, 589, 601, 607, 819, 821, 845, 851, 853, 877, 925, 931, 1021, 1039, 1069
OFFSET
1,3
COMMENTS
Is a(n)/n^2 bounded? It seems that 0.2 < a(n)/n^2 <= 1.
LINKS
MATHEMATICA
Select[Range[0, 1000], !Divisible[Binomial[6*#, #]/(5*# + 1), 6] &] (* Amiram Eldar, Jun 04 2021 *)
CROSSREFS
Cf. A000225 (C(2*k, k)/(k+1) is not divisible by 2), A003462 (C(3*k, k)/(2*k+1) is not divisible by 3), A003463 (C(5*k, k)/(4*k+1) is not divisible by 5).
Sequence in context: A139440 A102607 A360688 * A325422 A190213 A216574
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 14 2003
STATUS
approved