Search: id:A082470
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%I A082470
%S A082470 2,1,3,4,5,3,6,7,6,6,9,11,9,5,10,9,10,9,9,8,9,9,11,8,10,10,12,16,12,10,
               10,
%T A082470 13,14,14,16,11,12,9,15,10,9,8,12,9,10,6,8,7,14,13,10,21,15,9,13,11,9,
%U A082470 19,12,13,16,11,19,17,9,13
%N A082470 Number of k >= 0 such that k! + prime(n) is prime.
%C A082470 k! + p is composite for k >= p since p divides k! for k >= p.
%e A082470 For n = 4, 3!+7 = 13, 4!+7=31, 5!+7=127 and 6!+7 = 727 are the 4 primes 
               in n!+7
%p A082470 for i from 2 to 50 do ctr := 0: for j from 2 to ithprime(i)-1 do if isprime(j!+ithprime(i))=true 
               then ctr := ctr+1 fi od; print(ctr); od;
%o A082470 (PARI) nfactppct(n) = { forprime(p=1,n, c=0; for(x=0,n,y=x!+p;if(isprime(y),
               c++) ); print1(c",") ) } - Cino Hilliard (hillcino368(AT)gmail.com), 
               Apr 15 2004
%Y A082470 Sequence in context: A085985 A088267 A117407 this_sequence A101204 A035043 
               A155963
%Y A082470 Adjacent sequences: A082467 A082468 A082469 this_sequence A082471 A082472 
               A082473
%K A082470 nonn,more
%O A082470 2,1
%A A082470 Jeff Burch (gburch(AT)erols.com), Apr 27 2003
%E A082470 Edited by Frank Adams-Watters (FrankTAW(AT)Netscape.net), Aug 01 2006

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