A231597 Total number of 8's digits in primes less than 10^n.

0, 2, 30, 351, 3690, 38541, 394398, 3998411, 40399778, 407316676, 4099892369, 41217744252, 414006129652, 4155543234392

Offset

1,2

Links

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

Example

a(2)=2, since there are 2 8's in primes less than 100. Namely: 83, 89.

Mathematica

Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 8, 2], {n, 7}] (* Robert Price, Jun 16 2019 *)

Crossrefs

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

Sequence in context: A089433 A152277 A230610 * A216119 A083446 A230726

Adjacent sequences: A231594 A231595 A231596 * A231598 A231599 A231600

Keyword

more,nonn,base

Author

Robert Price, Nov 11 2013

Extensions

a(14) from Giovanni Resta, Jul 20 2015

Status

approved