A265897 Numbers n for which (2n+1)! / n! [= A000407(n)] is >= k! but < 2*k! for some k; positions of ones in A265891.

0, 1, 3, 8, 11, 14, 17, 20, 23, 30, 37, 41, 52, 56, 60, 64, 68, 72, 76, 89, 93, 97, 106, 110, 119, 128, 132, 137, 146, 155, 164, 169, 178, 183, 197, 202, 216, 221, 226, 231, 260, 265, 270, 275, 280, 285, 290, 295, 300, 331, 336, 341, 346, 351, 367, 372, 377, 393, 398, 403, 414, 419, 435, 440, 451, 456, 467, 472, 483, 494, 499, 510

Offset

0,3

Comments

a(0) = 0 is a special case in this sequence, thus the indexing starts from zero.

Numbers n such that A000407(n) is in A265334.

Links

Antti Karttunen, Table of n, a(n) for n = 0..845

Crossrefs

Cf. A000407, A265891, A265334.

Cf. also A265898.

Sequence in context: A366582 A051245 A373831 * A003157 A310281 A287365

Adjacent sequences: A265894 A265895 A265896 * A265898 A265899 A265900

Keyword

nonn

Author

Antti Karttunen, Dec 24 2015

Status

approved