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A073094 Final digit of C(2k,k) when not equal to zero. 1
2, 6, 2, 4, 2, 6, 2, 6, 2, 4, 2, 4, 8, 4, 2, 4, 2, 6, 2, 6, 2, 4, 2, 6, 2, 6, 2, 4, 2, 4, 8, 4, 2, 4, 2, 4, 8, 4, 8, 6, 8, 4, 8, 4, 2, 4, 2, 4, 8, 4, 2, 4, 2, 6, 2, 6, 2, 4, 2, 6, 2, 6, 2, 4, 2, 4, 8, 4, 2, 4, 2, 6, 2, 6, 2, 4, 2, 6, 2, 6, 2, 4, 2, 4, 8, 4, 2, 4, 2, 4, 8, 4, 8, 6, 8, 4, 8, 4, 2, 4, 2, 4, 8, 4, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Sequence contains 2,4,6,8, only.

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = C(2*A037453(n), A037453) reduced modulo 10.

MAPLE

f:= proc(n) local L, r;

  L:= convert(n, base, 3);

  r:= 2 &^ numboccur(1, L) mod 5;

  r + 5*(r mod 2)

end proc:

map(f, [$1..200]); # Robert Israel, Jun 11 2018

MATHEMATICA

Mod[#, 10]&/@Table[Binomial[2n, n], {n, 800}]/.(0->Nothing) (* Harvey P. Dale, Apr 14 2018 *)

CROSSREFS

Sequence in context: A265993 A115009 A151944 * A194953 A057606 A021385

Adjacent sequences:  A073091 A073092 A073093 * A073095 A073096 A073097

KEYWORD

easy,nonn,base

AUTHOR

Benoit Cloitre, Aug 18 2002

STATUS

approved

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Last modified May 8 12:57 EDT 2021. Contains 343666 sequences. (Running on oeis4.)