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 A119351 #16 Mar 26 2025 11:30:03 %S A119351 1,2,27,151,461,2056 %N A119351 Indices k of prime palindromic numbers formed by taking k digits in the decimal expansion of Pi and reflecting about the last digit. %C A119351 The primes corresponding to these indices are A039954. %C A119351 a(7) > 50000. - _Michael S. Branicky_, Feb 11 2025 %H A119351 Shyam Sunder Gupta, <a href="https://doi.org/10.1007/978-981-97-2465-9_19">Mystery of pi</a>, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 19, 473-497. %e A119351 Of 3, 313, 31413, 3141413, 314151413, the first and second are primes, so the first two terms are 1 and 2. %Y A119351 Cf. A039954. %K A119351 nonn,more,base %O A119351 1,2 %A A119351 _Eric W. Weisstein_, May 15 2006; corrected May 27 2006