A231594 Total number of 5's digits in primes less than 10^n.

1, 3, 33, 360, 3816, 38911, 396016, 4015732, 40543671, 408462140, 4109293287, 41296082801, 414669334188, 4161237526152

Offset: 1

Author

Robert Price, Nov 11 2013

Keywords

• more
• nonn
• base

Examples

			a(2)=3, since there are 3 5's in primes less than 100. Namely: 5, 53, 59.
		

Crossrefs

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

Programs

Mathematica

Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 5, 2], {n, 7}] (* Robert Price, Jun 16 2019 *)

Extensions

a(14) from Giovanni Resta, Jul 20 2015