A152275 Number of 3's among the digits of all n-digit primes.

1, 8, 66, 602, 5552, 52541, 505880, 4907822, 47923752, 469985783, 4625005356, 45629711436, 451086676886, 4466423651321

Offset: 1

Author

Jon E. Schoenfield, Dec 01 2008

Keywords

• base
• nonn

Crossrefs

Cf. A130817, A152272, A152273, A152274, A152276, A152277, A152278, A152279, A152280, A152281.

Programs

Mathematica

Join[{1},Table[Count[Flatten[IntegerDigits/@Prime[Range[PrimePi[10^(n-1)]+ 1,PrimePi[10^n]]]],3],{n,2,11}]] (* Harvey P. Dale, Dec 18 2011 *)

Extensions

a(12)-a(14) from Giovanni Resta, Jul 20 2015