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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 April 22 01:34 EDT 2024. Contains 371887 sequences. (Running on oeis4.)