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Search: id:A118769
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| A118769 |
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Primes of the form n! - n!! + 1. |
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+0
2
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| 17, 673, 39937, 87177646081, 6402373519933441, 304888344611712432172380979201, 12688693218588416410343338933516148080286551504440685299947926182022393070106968\ 0640000001
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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n=4 4! - 4!! + 1 = 4*3*2*1 - 4*2 + 1 = 24 - 8 + 1 = 17
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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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Sequence in context: A012219 A063941 A089018 this_sequence A009158 A012050 A012157
Adjacent sequences: A118766 A118767 A118768 this_sequence A118770 A118771 A118772
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KEYWORD
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nonn
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AUTHOR
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Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), May 22 2006
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