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 A215538 #17 Apr 17 2025 02:03:12 %S A215538 43,59,661,1597,3853,6073,7723,12097 %N A215538 Numbers k such that 101^k - 100^k is prime. %C A215538 Terms found by Mike Oakes. No more term <= 10000. %C A215538 a(9) > 40000. - _Michael S. Branicky_, Apr 16 2025 %t A215538 Select[Prime[Range[PrimePi[1000]]], PrimeQ[101^# - 100^#] &] (* _T. D. Noe_, Aug 15 2012 *) %o A215538 (PARI) is(n)=ispseudoprime(101^n-100^n) \\ _Charles R Greathouse IV_, Jun 06 2017 %K A215538 nonn,hard,more %O A215538 1,1 %A A215538 _Jean-Louis Charton_, Aug 15 2012 %E A215538 a(8) from _Tim Johannes Ohrtmann_, Jan 28 2018