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 A105980 #16 Sep 11 2023 09:10:36
%S A105980 443,449,4441,4447,44449,444443,444449,444444443,4444444447,
%T A105980 44444444441,444444444443,44444444444444444447,
%U A105980 44444444444444444444444447,4444444444444444444444444441,444444444444444444444444444443
%N A105980 Near-repdigit primes with at least two 4's as the repeated digit.
%H A105980 Harvey P. Dale, <a href="/A105980/b105980.txt">Table of n, a(n) for n = 1..26</a>
%e A105980 a(2)=449 is a term because all digits are equal to 4 except one.
%t A105980 Select[Flatten[Table[FromDigits[PadLeft[{n},x,4]],{x,3,30},{n,{1,3,7,9}}]],PrimeQ] (* _Harvey P. Dale_, Feb 18 2018 *)
%Y A105980 Cf. A105976, A105978, A107979, A105980, A105982, A365592, A365596, A365597, A365598.
%K A105980 base,nonn
%O A105980 1,1
%A A105980 _Shyam Sunder Gupta_, Apr 29 2005
%E A105980 More terms from _Harvey P. Dale_, Feb 18 2018
%E A105980 Name clarified by _Robert Price_, Sep 10 2023