1,2

p = First[ RealDigits[ Pi, 10, 10^5]]; p = p[[ Select[ Range[10^5], p[[ # ]] == 0 || p[[ # ]] == 1 || p[[ # ]] == 2 || p[[ # ]] == 3 || p[[ # ]] == 4 || p[[ # ]] == 5 & ]]]; Do[ If[ PrimeQ[ FromDigits[ Take[p, n], 6]], Print[n]], {n, 1, 3000} ]

Sequence in context: A146506 A024261 A129434 this_sequence A113252 A003737 A012071

Adjacent sequences: A065571 A065572 A065573 this_sequence A065575 A065576 A065577

nonn,base

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 01 2001