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Search: id:A118913
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| A118913 |
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Primes of the form n! + (n+1)! + 1. |
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+0
8
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| 3, 31, 45361, 3991681, 2516506653355019284889240277665777045474566836669417196965412366518489408149127168000000000000001
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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n=3 3! + 4! + 1 = 6 + 24 + 1 = 31
n=7 7! + 8! + 1 = 5040 + 40320 + 1 = 45361
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MAPLE
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P:=proc(n) local i, j; for i from 1 by 1 to n do j:=i!+(i+1)!+1; if isprime(j) then print(j); fi; od; end: P(200);
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CROSSREFS
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indices in A087147 [From Dmitry Kamenetsky (dkamen(AT)rsise.anu.edu.au), Oct 21 2008]
Sequence in context: A134721 A002707 A144964 this_sequence A005042 A136582 A119937
Adjacent sequences: A118910 A118911 A118912 this_sequence A118914 A118915 A118916
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KEYWORD
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easy,nonn,new
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AUTHOR
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Paolo P. Lava and Giorgio Balzarotti (ppl(AT)spl.at), May 25 2006
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EXTENSIONS
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Added the first term, because 0!+1!+1=3 is prime. Dmitry Kamenetsky (dkamen(AT)rsise.anu.edu.au), Oct 21 2008
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