A068359 Binomial(2k,k) when the first digit of binomial(2k,k) is 1.

1, 12870, 184756, 10400600, 155117520, 137846528820, 126410606437752, 1946939425648112, 118264581564861424, 1832624140942590534, 112186277816662845432, 1746130564335626209832, 107507208733336176461620, 1678910486211891090247320, 103827421287553411369671120

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Mathematica

a={}; kmax=40; For[k=0, k<=kmax, k++, If[First[IntegerDigits[term = Binomial[2k, k]]]==1, AppendTo[a, term]]]; a (* Stefano Spezia, Sep 06 2022 *)

Crossrefs

Intersection of A000984 and A131835.

Cf. A068358 (k values).

Sequence in context: A024752 A024760 A245861 * A177310 A140917 A351487

Adjacent sequences: A068356 A068357 A068358 * A068360 A068361 A068362

Keyword

easy,nonn,base

Author

Benoit Cloitre, Feb 28 2002

Extensions

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

Status

approved