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A049420
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Composite numbers n such that (n!/n#)+1 is prime, where n# = primorial numbers A034386.
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5
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4, 8, 14, 20, 26, 34, 56, 104, 153, 182, 194, 217, 230, 280, 462, 529, 1445, 2515, 3692, 6187, 6851, 13917
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OFFSET
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1,1
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COMMENTS
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Note that n!/n# is known as n compositorial.
Subset of A140294. Prime numbers are excluded since n!/n# = (n-1)!/(n-1)# when n is prime. - Giovanni Resta, Mar 28 2013
a(23) > 14000. Giovanni Resta, Apr 02 2013
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LINKS
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Table of n, a(n) for n=1..22.
Chris Caldwell, Compositorial
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CROSSREFS
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Cf. A034386, A140293, A140294, A140315, A049421.
Sequence in context: A066941 A176949 A173522 * A055507 A121896 A173290
Adjacent sequences: A049417 A049418 A049419 * A049421 A049422 A049423
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KEYWORD
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nonn
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AUTHOR
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Paul Jobling (paul.jobling(AT)whitecross.com)
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EXTENSIONS
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a(20) from Giovanni Resta, Mar 28 2013
a(21)-a(22) from Giovanni Resta, Apr 02 2013
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STATUS
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approved
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