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 A216071 Brocard's problem: positive integers m such that m^2 = n! + 1 for some n. 4
 5, 11, 71 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A085692 and A146968 for links, references and comments. - M. F. Hasler, Nov 20 2018 LINKS FORMULA a(n) = A000196(A085692(n)) = A000196(A038507(A146968(n))) where A000196 = sqrt and A038507(n) = n! + 1. - M. F. Hasler, Nov 20 2018 MATHEMATICA Sqrt[#!+1]&/@Select[Range[1000], IntegerQ[Sqrt[#!+1]]&] (* Harvey P. Dale, Sep 29 2012 *) PROG (PARI) apply( sqrtint, A085692) \\ M. F. Hasler, Nov 20 2018 (PARI) select( is_A216071(m)=m^2==A084558(m^2)!+1, [0..99]) \\ M. F. Hasler, Nov 20 2018 CROSSREFS A085692, A146968, A216071 are all essentially the same sequence. - N. J. A. Sloane, Sep 01 2012 Sequence in context: A121170 A239322 A101209 * A050568 A065555 A189802 Adjacent sequences:  A216068 A216069 A216070 * A216072 A216073 A216074 KEYWORD nonn,hard,bref AUTHOR V. Raman, Sep 01 2012 STATUS approved

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Last modified October 17 04:09 EDT 2019. Contains 328106 sequences. (Running on oeis4.)