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 A076056 #19 Sep 08 2022 08:45:07 %S A076056 19,23,29,41,43,47,53,59,61,67,83,89,103,109,127,137,139,163,173,193, %T A076056 197,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293, %U A076056 307,317,331,349,367,379,397,401,409,419,421,431,433,439,443,449,457 %N A076056 Primes which when read backwards are composite numbers. %C A076056 Subsidiary sequences that could be added:(1) Start of the first occurrence of n consecutive primes in the above sequence. (2) Start of the first occurrence of n consecutive primes with digit reversal also a prime. %C A076056 The subsidiary sequence (1) with the indices at which n>=2 consecutive primes are first found in this sequence is 1, 1, 4, 4, 4, 4, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, ... - _R. J. Mathar_, May 22 2009 %C A076056 Subsequence of A151768. - _Reinhard Zumkeller_, Jul 06 2009 %H A076056 Anders Hellström, <a href="/A076056/b076056.txt">Table of n, a(n) for n = 1..10000</a> %H A076056 Anders Hellström, <a href="/A076056/a076056.spyx.txt">Sage program</a> %t A076056 Select[Prime[Range[100]], !PrimeQ[FromDigits[Reverse[IntegerDigits[ # ]]]]&] %o A076056 (Magma) [p: p in PrimesUpTo(500)|not IsPrime(Seqint(Reverse(Intseq(p))))]; // _Vincenzo Librandi_, Jun 03 2019 %Y A076056 Cf. A076055. %Y A076056 Complement of A007500 with respect to A000040. [From _Reinhard Zumkeller_, Jul 06 2009] %K A076056 base,nonn %O A076056 1,1 %A A076056 _Amarnath Murthy_, Oct 04 2002 %E A076056 More terms from _Harvey P. Dale_, Oct 11 2002