Search: id:A097445
Results 1-1 of 1 results found.

%I A097445
%S A097445 19,197,2293,30011,510463,9699653,223092809,6469693163,200560490051,
%T A097445 7420738134703,304250263527157,13082761331669881,614889782588491313,
%U A097445 32589158477190044641,1922760350154212638961,117288381359406970983047
%N A097445 Second occurrence where n# - p is prime for primes p = 3,5,...
%C A097445 Care has to be taken to start with a large enough n to be sure terms 
               are not missed. This was for n=100. This and A097444 were difficult 
               to obtain using PARI.
%F A097445 n# is n primorial = product of primes 2*3*5*...*p<=n
%e A097445 3#=2*3 = 6. 6-3=3 first prime, 6-5 = 1 not prime thus 3#-p is omitted.
%e A097445 5# = 2*3*5 = 30. 30-7 = 23 first prime,30-11 = 19 second prime.
%o A097445 (PARI) primorm2(n) = { pr=1; for(x=1,n, f=1; pr*=prime(x); for(m=1,n, 
               y=pr-prime(m); if(isprime(y),f=1; for(m=m+1,n, y=pr-prime(m); if(isprime(y),
               print1(y",");f=0;break,f=1)); ); if(f==0,break) ) ) }
%Y A097445 Sequence in context: A120791 A048556 A141995 this_sequence A058370 A164890 
               A066007
%Y A097445 Adjacent sequences: A097442 A097443 A097444 this_sequence A097446 A097447 
               A097448
%K A097445 nonn
%O A097445 2,1
%A A097445 Cino Hilliard (hillcino368(AT)gmail.com), Aug 23 2004

Search completed in 0.001 seconds