A231592 Total number of 3's digits in primes less than 10^n.

1, 9, 75, 677, 6229, 58770, 564650, 5472472, 53396224, 523382007, 5148387363, 50778098799, 501864775685, 4968288427006

Offset: 1

Author

Robert Price, Nov 11 2013

Keywords

• nonn
• base
• more

Examples

			a(2)=9, since there are 9 3's in primes less than 100. Namely: 3, 13, 23, 31, 37, 43, 53, 73, 83.
		

Crossrefs

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

Programs

Mathematica

Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 3, 2], {n, 7}] (* Robert Price, Jun 16 2019 *)

Extensions

a(14) from Giovanni Resta, Jul 20 2015