A080385 Numbers k such that there are exactly 7 numbers j for which binomial(k, floor(k/2)) / binomial(k,j) is an integer, i.e., A080383(k) = 7.

12, 30, 56, 84, 90, 132, 154, 182, 220, 252, 280, 306, 312, 340, 374, 380, 408, 418, 440, 456, 462, 476, 532, 552, 598, 616, 624, 630, 644, 650, 660, 690, 756, 828, 840, 858, 870, 880, 884, 900, 918, 936, 952, 966, 986, 992, 1020, 1054, 1102, 1116, 1140, 1160

Offset

1,1

Links

Vaclav Kotesovec, Table of n, a(n) for n = 1..4963

Example

For n=12, the central binomial coefficient (C(12,6) = 924) is divisible by C(12,0), C(12,1), C(12,2), C(12,6), C(12,10), C(12,11), and C(12,12).

Crossrefs

Cf. A327430, A080384, A080386, A327431, A080387.

Cf. A001405, A057977.

Sequence in context: A277978 A131874 A111396 * A120090 A280344 A286497

Adjacent sequences: A080382 A080383 A080384 * A080386 A080387 A080388

Keyword

nonn

Author

Labos Elemer, Mar 12 2003

Extensions

More terms from Vaclav Kotesovec, Sep 06 2019

Status

approved