This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A091707 #18 Apr 23 2021 11:57:07
%S A091707 0,2,32,332,3225,31792,309431,2991216,28863327,278085918,2677289604,
%T A091707 25769815303,248050788931,2388172543971
%N A091707 Number of primes less than 10^n having at least one digit 6.
%e A091707 a(1) = 0 because of the 4 primes less than 10^1, none have at least one digit 6.
%t A091707 NextPrim[n_] := Block[{k = n + 1}, While[ !PrimeQ[k], k++ ]; k]; c = 0; p = 1; Do[ While[ p = NextPrim[p]; p < 10^n, If[ Position[ IntegerDigits[p], 6] != {}, c++ ]]; Print[c]; p--, {n, 1, 8}] (* _Robert G. Wilson v_, Feb 02 2004 *)
%o A091707 (Python)
%o A091707 from sympy import sieve # use slower primerange for larger terms
%o A091707 def a(n): return sum('6' in str(p) for p in sieve.primerange(2, 10**n))
%o A091707 print([a(n) for n in range(1, 8)]) # _Michael S. Branicky_, Apr 23 2021
%Y A091707 a(n) + A091640(n) = A006880(n).
%Y A091707 Cf. A091644, A091645, A091646, A091647, A091705, A091706, A091708, A091709, A091710.
%K A091707 nonn,base
%O A091707 1,2
%A A091707 _Enoch Haga_, Jan 30 2004
%E A091707 Edited and extended by _Robert G. Wilson v_, Feb 02 2004
%E A091707 3 more terms from _Ryan Propper_, Aug 21 2005
%E A091707 a(13) from _Robert Price_, Nov 11 2013
%E A091707 a(14) from _Giovanni Resta_, Jul 21 2015