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 A083393 #12 Jul 17 2025 12:33:02 %S A083393 2,3,5,7,11,101,111,131,151,191,212,232,272,292,313,353,373,434,454, %T A083393 494,515,535,575,595,616,656,676,737,757,797,818,838,878,919,959,1001, %U A083393 10001,10101,10301,10501,10901,11111,11311,11711,11911,12121,12521,12721 %N A083393 Palindromes such that the sum of the digits is prime. %C A083393 Suggested by _Amarnath Murthy_ %H A083393 Chai Wah Wu, <a href="/A083393/b083393.txt">Table of n, a(n) for n = 1..10000</a> %e A083393 12121 is a member because 1+2+1+2+1=7, 7 is prime. %t A083393 Select[Range[15000],PalindromeQ[#]&&PrimeQ[Total[IntegerDigits[#]]]&] (* _Harvey P. Dale_, Jul 17 2025 *) %K A083393 nonn,base %O A083393 1,1 %A A083393 Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 11 2003 %E A083393 Corrected and extended by _Jason Earls_, Jun 12 2003