A231590 Total number of 1's digits in primes less than 10^n.

0, 9, 78, 681, 6353, 59634, 570157, 5510645, 53680317, 525651276, 5166809159, 50931212973, 503152799893, 4979293536415

Offset

1,2

Links

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

Example

a(2)=9, since there are 9 1's in primes less than 100. Namely: 11, 13, 17, 19, 31, 41, 61, 71.  Note that 11 counts for two.

Mathematica

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

Crossrefs

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

Sequence in context: A350428 A190980 A254657 * A240797 A279683 A123918

Adjacent sequences: A231587 A231588 A231589 * A231591 A231592 A231593

Keyword

nonn,base,more

Author

Robert Price, Nov 11 2013

Extensions

a(14) from Giovanni Resta, Jul 20 2015

Status

approved