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 A320880 #13 Feb 10 2019 05:19:50
%S A320880 56676324799,373169411809,2121959132809,10180781225809,14328311692789,
%T A320880 17429111275789,32594135422789,34327062247789,39262151325799,
%U A320880 57404320087789,60760513291789,63116080460809,66105224572789,92054642332789,98606700040789
%N A320880 Primes such that iteration of A062028 (n + its digit sum) yields 8 primes in a row.
%C A320880 Term a(1) is immediate to find from the nearly equal terms A320879(7..8); terms a(2..9) were found by G. Resta as answer to Rivera's Puzzle 163, cf. link.
%H A320880 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_163.htm">Puzzle 163. P+SOD(P)</a>
%F A320880 A320880 = { n in A320879 | A062028(n) in A320879 }.
%o A320880 (PARI) is_A320880(n)=isprime(n=A062028(n))&& is_A320879(n)
%Y A320880 Cf. A047791, A048519, A062028 (n + digit sum of n).
%Y A320880 Cf. A048523 .. A048527.
%Y A320880 Subsequence of A320879 which is subsequence of A320878.
%Y A320880 a(1) = A090009(9) = start of first chain of 9 primes under iteration of A062028.
%K A320880 nonn,base
%O A320880 1,1
%A A320880 _Zak Seidov_ and _M. F. Hasler_, Nov 08 2018
%E A320880 a(10)-a(15) from _Lars Blomberg_, Feb 10 2019