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 A280419 #22 Apr 03 2023 10:36:13 %S A280419 1468910121415161820212224252627283032333435363839, %T A280419 14689101214151618202122242526272830323334353638394042444546484950515254555657586062636465666869 %N A280419 Primes in A132934. %C A280419 Primes that can be obtained from concatenation of the nonprime numbers. %C A280419 In other words: primes that can be obtained from concatenation of 1 and the next consecutive composite numbers. %C A280419 For a(n), the smallest prime divisor is a(n) and a(n) is a term of A241845. %H A280419 Prime Curios!, <a href="https://t5k.org/curios/page.php/39.html">39</a> %Y A280419 Cf. A002808, A018252, A132934, A241845. %K A280419 nonn,base,bref %O A280419 1,1 %A A280419 _Sergey Pavlov_, Jan 02 2017