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URL: https://oeis.org/A228413

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A228413
Count of the first 10^n primes which do not contain the digit 1.
20
1, 6, 54, 532, 4675, 34425, 262549, 2051466, 16831152, 155616459, 1529462564, 14830618421, 141585123501
OFFSET
0,2
FORMULA
a(n) <= 9^n. - Charles R Greathouse IV, May 21 2014
EXAMPLE
a(2) = 54 since there are 54 primes less than 541 (the 100th prime) that do not contain a 1. Namely: 2, 3, 5, 7, 23, 29, ..., 523.
MATHEMATICA
Table[Length[Select[Range[10^n], DigitCount[Prime[#], 10, 1] == 0 &]], {n, 0, 5}] (* Robert Price, Mar 23 2020 *)
KEYWORD
nonn,base,more,hard
AUTHOR
Robert Price, Nov 09 2013
EXTENSIONS
a(12) from Lucas A. Brown, Mar 19 2024
STATUS
approved