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Search: id:A112565
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| A112565 |
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Main diagonal of square table A112564 of generalized Flavius Josephus sieves. |
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+0
9
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| 1, 2, 7, 28, 125, 546, 2527, 11096, 43633, 186130, 809831, 3423432, 14022373, 58574894, 250708291, 1038612976, 4353755777, 18333324162, 74663736859, 311293807040, 1286700247561, 4917768055222, 20458840039199, 83985256000824
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Appears to be a self-convolution of an integer sequence (A112567).
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FORMULA
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a(n) = 1 + n*A112566(n) for n>=0.
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PROGRAM
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(PARI) {a(n)=local(A=n, B=0, C=0); if(n==0, 1, until(A==B, C=C+1; if(C%n==0, C=C+1); B=A; A=floor(A*(C+1)/C)); 1+A)}
Contribution from David Wasserman (dwasserm(AT)earthlink.net), Jun 25 2009: (Start)
(PARI) A002491(n) = local(a, b); a = n; b = n - 1; while (b > 1, a = b*ceil(a/b); b--); a;
T(n, k) = local(A = k, C = 1, q, d, x); if (n*k == 0, return(1)); if (n == 1, return(A002491(k + 1))); while (q = A\C, d = A%C; x = d\q + 1; A += x*(n - 1)*(A\C); C += x*n); 1 + A; (End)
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CROSSREFS
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Cf. A112564, A112566, A112567, A112568.
Sequence in context: A060379 A002931 A088702 this_sequence A118926 A127084 A052319
Adjacent sequences: A112562 A112563 A112564 this_sequence A112566 A112567 A112568
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Oct 14 2005
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EXTENSIONS
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More terms from David Wasserman (dwasserm(AT)earthlink.net), Jun 25 2009
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