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 A160405 #9 Sep 08 2022 08:45:45 %S A160405 10007100000310037,10007100000310163,10007100000310247, %T A160405 10007100000310271,10007100000310289,10007100000310321, %U A160405 10007100000310433,10007100000310463,10007100000310477 %N A160405 Primes that are the concatenation of a 5-digit prime, a 7-digit prime, and a 5-digit prime. %C A160405 Haiku-haiku-haiku primes. I would like to call these "Haiku primes" but it seems that name has been used by _Geoffrey Caveney_ for a different concept. Another possible name would be haiku-formed primes, but maybe that should be reserved for primes which are formed from any number of primes of width 5 or 7. Note that if you associate the hyphens with the central word, Haiku-haiku-haiku is itself of the 5-7-5 form (in characters). %H A160405 Wikipedia, <a href="http://en.wikipedia.org/wiki/Haiku">Haiku</a> %e A160405 10007, 1000003, 10037, and 10007100000310037 are all prime, so 10007100000310037 is in the sequence. %o A160405 (Magma) [ a: p in PrimesInInterval(10000,10007), q in PrimesInInterval(1000000,1000003), r in PrimesInInterval(10000,12000) | IsPrime(a) where a is Seqint(Intseq(r) cat Intseq(q) cat Intseq(p)) ]; // _Klaus Brockhaus_, May 20 2009 %Y A160405 Cf. A000040 (primes), A006879 (number of primes with n digits). %K A160405 base,fini,nonn %O A160405 1,1 %A A160405 _Walter Nissen_, May 13 2009 %E A160405 Edited by _Klaus Brockhaus_, May 20 2009