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 A244369 #14 May 22 2025 10:21:39 %S A244369 101,787,34543,7654567,345676543,34567876543 %N A244369 Palindromic right-angled primes. %C A244369 Intersection of A002113 and A167842. %C A244369 Intersection of A002385 and A135602. %C A244369 The last term of this sequence is also the last term of A134811. %e A244369 Illustration of a(6) = 34567876543, the last term of this sequence: %e A244369 . . . . . . . . . . . %e A244369 . . . . . 8 . . . . . %e A244369 . . . . 7 . 7 . . . . %e A244369 . . . 6 . . . 6 . . . %e A244369 . . 5 . . . . . 5 . . %e A244369 . 4 . . . . . . . 4 . %e A244369 3 . . . . . . . . . 3 %e A244369 . . . . . . . . . . . %e A244369 . . . . . . . . . . . %e A244369 . . . . . . . . . . . %o A244369 (Python) %o A244369 from sympy import isprime %o A244369 A244369 = [] %o A244369 for n in range(1,10): %o A244369 for m in range(n-1,-1,-1): %o A244369 l = ''.join([str(d) for d in range(n,m-1,-1)]) %o A244369 p = int(l+l[-2::-1]) %o A244369 if isprime(p): %o A244369 A244369.append(p) %o A244369 for m in range(n+1,10): %o A244369 l = ''.join([str(d) for d in range(n,m+1)]) %o A244369 p = int(l+l[-2::-1]) %o A244369 if isprime(p): %o A244369 A244369.append(p) %o A244369 A244369 = sorted(A244369) # _Chai Wah Wu_, Aug 15 2014 %Y A244369 Cf. A000040, A002113, A002385, A134811, A135602, A167842. %K A244369 nonn,base,fini,full %O A244369 1,1 %A A244369 _Omar E. Pol_, Jun 26 2014