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 A110789 #17 Nov 21 2024 06:12:02 %S A110789 1,1,2,4,5,10,23,102,102,138,451,1922,1624,5630,26410 %N A110789 Number of digits in A110788(n). %o A110789 (Python) %o A110789 from sympy import isprime %o A110789 from itertools import count, islice %o A110789 def agen(): # generator of terms %o A110789 s = "" %o A110789 while True: %o A110789 for d in "71": %o A110789 for k in count(1): %o A110789 if isprime(int(s+d*k)): break %o A110789 yield k %o A110789 s += d*k %o A110789 print(list(islice(agen(), 11))) # _Michael S. Branicky_, Aug 23 2022 %Y A110789 Cf. A110774, A110775, A110776, A110777, A110778, A110780, A110781, A110782, A110783, A110788. %K A110789 base,nonn,more %O A110789 1,3 %A A110789 _Amarnath Murthy_, Aug 13 2005 %E A110789 More terms from _Joshua Zucker_, Jan 11 2006 %E A110789 a(12) from _Sean A. Irvine_, Mar 22 2010 %E A110789 a(13)-a(14) from _Michael S. Branicky_, Aug 23 2022 %E A110789 a(15) from _Michael S. Branicky_, Nov 20 2024