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A231412
Count of the first 10^n primes which do not contain the digit 0.
20
1, 10, 91, 819, 7122, 61702, 557224, 5062320, 45002763, 395879190, 3579400605, 32487367715, 294505958253
OFFSET
0,2
FORMULA
a(n) <= 9^n. - Charles R Greathouse IV, May 21 2014
EXAMPLE
a(2) = 91 = 100-9 since only 9 primes less than 541 (the 100th prime) contain a zero. Namely: 101, 103, 107, 109, 307, 401, 409, 503, 509.
MATHEMATICA
Table[Length[Select[Range[10^n], DigitCount[Prime[#], 10, 0] == 0 &]], {n, 0, 5}] (* Robert Price, Mar 23 2020 *)
KEYWORD
nonn,base,more,hard
AUTHOR
Robert Price, Nov 08 2013
EXTENSIONS
a(12) from Lucas A. Brown, Mar 19 2024
STATUS
approved