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 A109749 #8 Apr 16 2024 15:59:05 %S A109749 1,3,4,7,18,30,82,99,105,106,147,334,1092,1221,3705,5524,30355,35962 %N A109749 Numbers n such that 88 * 10^n + 1 is prime. %C A109749 All terms have been certified. Primality proof for the largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] Primality testing 88*10^30355+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Calling Brillhart-Lehmer-Selfridge with factored part 69.89% 88*10^30355+1 is prime! (491.3713s+0.8690s) %H A109749 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/prime_difficulty.txt">Search for 880w1</a>. %o A109749 (PARI) is(n)=ispseudoprime(88*10^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A109749 Cf. A056804, A056797. %K A109749 more,nonn %O A109749 1,2 %A A109749 _Jason Earls_, Aug 11 2005 %E A109749 a(18) from Kamada data by _Tyler Busby_, Apr 16 2024