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 A096186 #13 Aug 07 2025 14:03:35
%S A096186 1,2,4,9,12,14,19,26,28,72,79,273,565,990,1166,2205,4212,5340,5562,
%T A096186 9877,10297,14316,35908,48410,61525
%N A096186 Numbers k such that 10^k+9^(k-1) is prime.
%C A096186 a(26) > 10^5. - _Robert Price_, Mar 28 2016
%t A096186 Do[ If[ PrimeQ[10^n + 9^(n - 1)], Print[n]], {n, 4000}]
%o A096186 (PARI) is(n)=isprime(10^n+9^(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A096186 Cf. A082103, A093717, A093793, A093765, A096185, A093794, A093795, A096186.
%K A096186 nonn
%O A096186 1,2
%A A096186 Herman H. Rosenfeld (herm3(AT)pacbell.net) and _Robert G. Wilson v_, Jun 21 2004
%E A096186 a(17)-a(25) from _Robert Price_, Mar 28 2016