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 A113303 Least number k such that prime(n) divides T(k), the central trinomial coefficient A002426(k), or 0 if there is no such k. 5
 0, 2, 0, 3, 0, 0, 5, 4, 0, 0, 0, 0, 8, 9, 6, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 26, 47, 12, 0, 7, 0, 0, 0, 0, 0, 0, 0, 28, 44, 0, 31, 51, 0, 61, 0, 0, 0, 0, 27, 0, 0, 0, 0, 0, 89, 0, 90, 135, 98, 48, 122, 120, 0, 0, 0, 0, 121, 0, 0, 0, 0, 112, 0, 91, 0, 0, 55, 63, 133, 48, 0, 0, 126, 179, 0, 78 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS When a(n)=0, prime(n) is in A113305. When a(n)>0, prime(n) is in A113304. LINKS T. D. Noe, Table of n, a(n) for n=1..1000 MATHEMATICA nn=1000; a=b=1; t=Join[{1}, Table[c=((2n-1)b+3(n-1)a)/n; a=b; b=c; c, {n, 2, nn}]]; Table[p=Prime[i]; k=1; While[k0, k++ ]; If[k==nn, 0, k], {i, PrimePi[nn]}] CROSSREFS Cf. A113302 (number of k for which prime(n) divides T(k)). Sequence in context: A071391 A102390 A127640 * A080089 A291044 A113290 Adjacent sequences:  A113300 A113301 A113302 * A113304 A113305 A113306 KEYWORD nonn AUTHOR T. D. Noe, Oct 24 2005 STATUS approved

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Last modified October 16 14:35 EDT 2018. Contains 316263 sequences. (Running on oeis4.)