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Search: id:A119497
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| A119497 |
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Primes of the form n! + n!! + 1. |
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+0
1
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| 3, 5, 769, 1405006117752879898543142713389983127221179514880001
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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n=2 2! + 2!! + 1 = 2 + 2 + 1 = 5
n=6 6! + 6!! + 1 = 720 + 48 + 1 = 769
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MAPLE
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SFACT:= proc(n) local i, j, k; for k from 1 by 1 to n do i:=k; j:=k-2; while j >0 do i:=i*j; j:=j-2; od: if isprime(k!+i+1) then print(k!+i+1); fi; od: end: SFACT(300);
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CROSSREFS
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Cf. A118769.
Sequence in context: A138584 A002427 A136134 this_sequence A012783 A062655 A090807
Adjacent sequences: A119494 A119495 A119496 this_sequence A119498 A119499 A119500
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KEYWORD
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easy,nonn
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AUTHOR
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Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), May 25 2006
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