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Search: id:A112863
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| A112863 |
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Numbers n such that (2*n)!/(2*(n!)^2)+1 is prime. |
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+0
6
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| 1, 3, 5, 6, 14, 19, 24, 45, 49, 62, 72, 122, 149, 197, 209, 222, 349, 409, 491, 527, 601, 675, 728, 769, 795, 853, 1039, 1318, 1599, 2069, 2279, 2567, 2634, 3286, 3482, 6880, 6919, 9117, 9276, 9564, 10898, 13061, 14570
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OFFSET
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1,2
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COMMENT
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The next term is > 11000.
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CROSSREFS
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Cf. A001700(n-1)=(2*n)!/(2*(n!)^2), A112864 primes of the form (2*n)!/(2*(n!)^2)+1, A112853 (2*n)!/n!-1 is prime, A112855 (2*n)!/n!+1 is prime, A066726 (2*n)!/(n!)^2-1 is prime, A112859 (2*n)!/(n!)^2+1 is prime, A112861 (2*n)!/(2*(n!)^2)-1 is prime.
Adjacent sequences: A112860 A112861 A112862 this_sequence A112864 A112865 A112866
Sequence in context: A064519 A048968 A092862 this_sequence A030052 A099678 A050563
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KEYWORD
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hard,nonn
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AUTHOR
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Hugo Pfoertner (hugo(AT)pfoertner.org), Sep 30 2005
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EXTENSIONS
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More terms from Charles R Greathouse IV, Sep 26 2006
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