A231595 Total number of 6's digits in primes less than 10^n.

0, 2, 33, 369, 3741, 38714, 395621, 4007705, 40484195, 408035120, 4105718243, 41266320918, 414416274953, 4159068898063

Offset: 1

Author

Robert Price, Nov 11 2013

Keywords

• more
• nonn
• base

Examples

			a(2)=2, since there are 2 6's in primes less than 100. Namely: 61, 67.
		

Crossrefs

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

Programs

Mathematica

Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 6, 2], {n, 7}] (* Robert Price, Jun 16 2019 *)

Extensions

a(14) from Giovanni Resta, Jul 20 2015