Search: id:A088866
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%I A088866
%S A088866 97,67,193,197,163,167,293,263,397,367,491,461,593,563,907,941,947,953,
%T A088866 991,977,983,607,641,647,653,677,683,661,1091,1093,1061,1063,1193,1163,
%U A088866 1597,1567,1901,1907,1913,1993,1997,1601,1607,1613,1663,1667,2297,2267
%N A088866 Primes where flipping 6 and 9 is also prime.
%e A088866 991 is prime. flipping the 9's we get 661 which is also prime.
%o A088866 (PARI) flip69pr(n) = { for(x=1,n, y=x; v=0; v1=0; f=0; ln =length(Str(x)); 
               a = vector(ln); b = vector(ln); forstep(j=ln,1,-1, r = y%10; a[j]=r; 
               b[j]=r; if(r==6,a[j] = 9;f=1); if(r==9,a[j] = 6;f=1); y = floor(y/
               10); ); forstep(j=ln,1,-1, v=v+a[j]*10^(ln-j); v1=v1+b[j]*10^(ln-j); 
               ); if(isprime(v) && isprime(v1) && f,print1(v",")); ) }
%Y A088866 Sequence in context: A094498 A068830 A033417 this_sequence A075478 A126146 
               A112667
%Y A088866 Adjacent sequences: A088863 A088864 A088865 this_sequence A088867 A088868 
               A088869
%K A088866 nonn,base
%O A088866 1,1
%A A088866 Cino Hilliard (hillcino368(AT)gmail.com), Nov 26 2003

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