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

1,2

Links

Table of n, a(n) for n=1..14.

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 *)

Crossrefs

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

Sequence in context: A197355 A121777 A056621 * A083385 A275230 A188450

Adjacent sequences: A152272 A152273 A152274 * A152276 A152277 A152278

Keyword

base,nonn

Author

Jon E. Schoenfield, Dec 01 2008

Extensions

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

Status

approved