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 A110783 #16 Oct 14 2024 15:34:12 %S A110783 2,1,3,3,2,8,21,102,25,726,954,16522,2939,10691,8157 %N A110783 Number of digits in A110782(n). %C A110783 a(12) > 7300. - _Michael S. Branicky_, Aug 24 2022 %o A110783 (Python) %o A110783 from sympy import isprime %o A110783 from itertools import count, islice %o A110783 def agen(): # generator of terms %o A110783 s = "" %o A110783 while True: %o A110783 for d in "1379": %o A110783 for k in count(1): %o A110783 if isprime(int(s+d*k)): break %o A110783 yield k %o A110783 s += d*k %o A110783 print(list(islice(agen(), 11))) # _Michael S. Branicky_, Aug 24 2022 %Y A110783 Cf. A110774, A110775, A110776, A110777, A110778, A110780, A110781, A110782. %K A110783 base,nonn,more %O A110783 1,1 %A A110783 _Amarnath Murthy_, Aug 12 2005 %E A110783 More terms from _Joshua Zucker_, Jan 11 2006 %E A110783 a(11) from _Sean A. Irvine_, Mar 22 2010 %E A110783 a(12)-a(15) from _Michael S. Branicky_, Oct 14 2024