A231598 - OEIS

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A231598

Total number of 9's digits in primes less than 10^n.

10

0, 6, 67, 646, 6130, 58145, 558956, 5432190, 53071838, 520787464, 5127052380, 50599825547, 500350977737, 4955299345646

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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

EXAMPLE

a(2)=6, since there are 6 9's in primes less than 100. Namely: 19, 29, 59, 79, 89, 97.

MATHEMATICA

Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 9, 2], {n, 7}] (* Robert Price, Jun 16 2019 *)

CROSSREFS

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

Sequence in context: A073326 A024203 A355051 * A073562 A354320 A230342

Adjacent sequences: A231595 A231596 A231597 * A231599 A231600 A231601

KEYWORD

nonn,base,more

AUTHOR

Robert Price, Nov 11 2013

EXTENSIONS

a(14) from Giovanni Resta, Jul 20 2015

STATUS

approved