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A135726
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Primes of the form n!!!-1 = A007661(n)-1, n>0.
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1
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2, 3, 17, 79, 4188799, 2504902399, 254561089305599, 13106744139423334399999, 8483004771271882804592639999, 706526001186582385898210420541078864497278132689882316799999999
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Sequence A084438 gives the easier-to-read n-values.
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LINKS
| Ken Davis, Status of Search for Multifactorial Primes
ProthSearch.net (on web.archive.org), n3minus.txt
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EXAMPLE
| a(4) = 79 = 8x5x2-1 = 8!!!-1 is the 4th prime of that form.
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PROG
| (PARI) A007661(n) = prod(i=1, (n-1)\3, n-=3, n+!n) /* newline */ for(n=1, 999, if(isprime(A007661(n)-1), print1(A007661(n)-1, ", ")))
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CROSSREFS
| Cf. A007661, A084438, A037082, A037083.
Sequence in context: A085874 A055739 A056794 * A164816 A042978 A089675
Adjacent sequences: A135723 A135724 A135725 * A135727 A135728 A135729
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KEYWORD
| nonn
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AUTHOR
| M. F. Hasler (Maximilian.Hasler(AT)gmail.com), Nov 26 2007
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