0,2

Prime Apery numbers include a(1) = 5, a(2) = 73, a(12) = 12073365010564729, and a(24). Semiprime central Delannoy numbers include a(4) = 33001 = 61 * 541. - Jonathan Vos Post (jvospost2(AT)yahoo.com), May 22 2005

R. Apery, Irrationalite de zeta(2) et zeta(3), in Journees Arith. de Luminy. Colloque International du Centre National de la Recherche Scientifique (CNRS) held at the Centre Universitaire de Luminy, Luminy, Jun 20-24, 1978. Asterisque, 61 (1979), 11-13.

R. Apery, ``Interpolation de fractions continues et irrationalit\'{e} de certaines constantes,'' in Math\'{e}matiques, Minist\`{e}re universit\'{e}s (France), Comit\'{e} travaux historiques et scientifiques. Bull. Section Sciences, Vol. 3, pp. 243-246, 1981.

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W. Koepf, Hypergeometric Summation, Vieweg, 1998, p. 146.

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T. D. Noe, Table of n, a(n) for n=0..100

J.-P. Allouche, A remark on Apery's numbers, J. Comput. Appl. Math. 83 (1997), 123-125.

E. Deutsch and B. E. Sagan, Congruences for Catalan and Motzkin numbers and related sequences, J. Num. Theory 117 (2006), 191-215.

S. Fischler, Irrationalit\'e de valeurs de z\^eta

L. Lipshitz and A. J. van der Poorten, Rational functions, diagonals, automata and arithmetic

V. Strehl, Recurrences and Legendre transform

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Eric Weisstein's World of Mathematics, Strehl Identities

Eric Weisstein's World of Mathematics, Schmidt's Problem

(n+1)^3*a(n+1) = (34*n^3 + 51*n^2 + 27*n +5)*a(n) - n^3*a(n-1), n >= 1.

Representation as a special value of the hypergeometric function 4F3, in Maple notation: a(n)=hypergeom([n+1, n+1, -n, -n], [1, 1, 1], 1), n=0, 1... - Karol A. Penson (penson(AT)lptl.jussieu.fr) Jul 24 2002

a(n) = Sum( k>=0, A063007(n, k)*A000172(k)). A000172 = Franel numbers. - DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Aug 14 2003

a := proc(n) option remember; if n=0 then 1 elif n=1 then 5 else (n^(-3))* ( (34*(n-1)^3 + 51*(n-1)^2 + 27*(n-1) +5)*a((n-1)) - (n-1)^3*a((n-1)-1)); fi; end;

Cf. A002736, A005258, A005259, A005429, A005430, A059415, A059416.

Cf. A063007, A000172.

Sequence in context: A099667 A108444 A127167 this_sequence A062440 A126748 A048144

Adjacent sequences: A005256 A005257 A005258 this_sequence A005260 A005261 A005262

nonn,easy,nice

Simon Plouffe (plouffe(AT)math.uqam.ca), njas