A068358 Numbers k such that the first digit of binomial(2k,k) is 1.

0, 8, 10, 13, 15, 20, 25, 27, 30, 32, 35, 37, 40, 42, 45, 47, 50, 52, 57, 62, 67, 72, 77, 82, 87, 92, 97, 102, 107, 112, 117, 122, 127, 132, 137, 142, 147, 152, 157, 162, 167, 172, 177, 182, 187, 190, 192, 195, 197, 200, 202, 205, 207, 210, 212, 215, 217, 220, 222

Offset

1,2

Links

David A. Corneth, Table of n, a(n) for n = 1..10001

Mathematica

Join[{0}, Select[Range[250], IntegerDigits[Binomial[2#, #]][[1]]==1&]] (* Harvey P. Dale, Dec 31 2017 *)

Crossrefs

Cf. A068359.

Sequence in context: A356522 A184116 A319795 * A203322 A120166 A030732

Adjacent sequences: A068355 A068356 A068357 * A068359 A068360 A068361

Keyword

easy,nonn,base

Author

Benoit Cloitre, Feb 28 2002

Extensions

a(1) = 0 inserted by Stefano Spezia, Sep 06 2022

Status

approved