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 A099661 #9 Jun 05 2025 23:32:18
%S A099661 2,11,79,787,7789,77783,777781,7777801,77777803,777777799,7777777781,
%T A099661 77777777827,777777777841,7777777777859,77777777777837,
%U A099661 777777777777787,7777777777777867,77777777777777797,777777777777777817
%N A099661 a(n) is the least prime following A002281(n) repdigits.
%e A099661 n=6: 77 is followed by 79.
%t A099661 Table[NextPrime[7*(10^n-1)/9], {n, 0, 35}]
%t A099661 NextPrime/@LinearRecurrence[{11,-10},{0,7},35] (* _Harvey P. Dale_, Dec 12 2021 *)
%Y A099661 Cf. A003618, A003617, A096497, A096498, A068104, A002275-A002283, A099656-A099668.
%K A099661 base,nonn
%O A099661 0,1
%A A099661 _Labos Elemer_, Nov 17 2004