A152281 Number of 9's among the digits of all n-digit primes.

0, 6, 61, 579, 5484, 52015, 500811, 4873234, 47639648, 467715626, 4606264916, 45472773167, 449751152190, 4454948367909

Offset

1,2

Links

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

Mathematica

Table[Count[Flatten[IntegerDigits/@Prime[Range[PrimePi[10^i]+1, PrimePi[10^(i+1)]]]], 9], {i, 0, 10}] (* Harvey P. Dale, Dec 08 2010 *)

Crossrefs

Cf. A130817, A152272, A152273, A152274, A152275, A152276, A152277, A152278, A152279, A152280.

Sequence in context: A069633 A069618 A155458 * A053462 A160751 A236670

Adjacent sequences: A152278 A152279 A152280 * A152282 A152283 A152284

Keyword

base,nonn

Author

Jon E. Schoenfield, Dec 01 2008

Extensions

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

Status

approved