{ n = 0; for (singledigit=1,9, if (isprime(singledigit), n = n+1; print(n" "singledigit) ) ); for (len=2,100, for (firstdigit=1,9, for (seconddigit=0,9, reason=seconddigit-firstdigit; candidate = sum(i=1,len,10^(len-i)*((firstdigit+(i-1)*reason)%10)); if (isprime(candidate), n = n+1; print(n" "candidate) ) ) ) ) }