

A228418


Count of the first 10^n primes which do not contain the digit 6.


0



1, 10, 90, 719, 6696, 60845, 554933, 4742037, 43331008, 392875212, 3573268469, 31207451849
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OFFSET

0,2


LINKS

Table of n, a(n) for n=0..11.


FORMULA

a(n) <= 9^n.  Charles R Greathouse IV, May 21 2014


EXAMPLE

a(1) = 10 since there are 10 primes in the first 10 (through 29) that do not contain a 6. Namely: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.


MATHEMATICA

Table[Length[Select[Range[10^n], DigitCount[Prime[#], 10, 6] == 0 &]], {n, 0, 5}] (* Robert Price, Mar 23 2020 *)


CROSSREFS

Cf. A231412, A228413A228421, A097952, A091634A091643.
Sequence in context: A202919 A202576 A201723 * A306958 A306957 A319893
Adjacent sequences: A228415 A228416 A228417 * A228419 A228420 A228421


KEYWORD

more,nonn,base


AUTHOR

Robert Price, Nov 09 2013


STATUS

approved



