A231598 Total number of 9's digits in primes less than 10^n.

0, 6, 67, 646, 6130, 58145, 558956, 5432190, 53071838, 520787464, 5127052380, 50599825547, 500350977737, 4955299345646

Offset: 1

Author

Robert Price, Nov 11 2013

Keywords

• nonn
• base
• more

Examples

			a(2)=6, since there are 6 9's in primes less than 100. Namely: 19, 29, 59, 79, 89, 97.
		

Crossrefs

Cf. A231411, A231590-A231598, A119290, A119291-A119300.

Programs

Mathematica

Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 9, 2], {n, 7}] (* Robert Price, Jun 16 2019 *)

Extensions

a(14) from Giovanni Resta, Jul 20 2015