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A119555
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Primes in the sequence a(n+1)=a(n)+[(-1)^n]*n!, with a(0)=0.
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19, 619, 35899, 3301819, 468544077492065936712052044718939948687543330546977719976017418129955876663406131164377030450551575840099843957105136480237871017419158043635450756712088769133544426722033165168878328322819566779381528981882285541609256481166622331374702000809600061055686236758821446539362161635577019
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| a(0)=0 a(1)=0 + [(-1)^1]*1! = 0 - 1 = -1 a(2)=-1 + [(-1)^2]*2! = -1 + 2 = 1 a(3)=1 + [(-1)^3]*3! = 1 - 6 = -5 a(4)=-5 + [(-1)^4]*4! = -5 + 24 = 19 that is prime
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FORMULA
| a(n+1)=a(n)+[(-1)^n]*n!, with a(0)=0
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MAPLE
| P:=proc(n) local i, j; j:=0; for i from 1 by 1 to n do j:=j+((-1)^i)*i!; if isprime(j) then print(j); fi; od; end: P(100);
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CROSSREFS
| Sequence in context: A075879 A180841 A183516 * A107118 A200849 A162012
Adjacent sequences: A119552 A119553 A119554 * A119556 A119557 A119558
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KEYWORD
| easy,nonn
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AUTHOR
| Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), May 30 2006
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