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 A279956 #10 Mar 07 2017 00:32:23 %S A279956 2,3,5,7,11,13,17,19,23,29,37,43,53,59,61,67,71,83,101,107,131,139, %T A279956 151,157,181,193,197,199,211,229,251,257,263,269,293,317,449,467,523, %U A279956 541,571,613,619,643,709,769,773,787,797,811,821,827,829,839,907,919,967,997,1019,1031,1061 %N A279956 Primes p such that every suffix of the base-4 representation of p is either a prime or 1. %H A279956 Indranil Ghosh, <a href="/A279956/b279956.txt">Table of n, a(n) for n = 1..807</a> %e A279956 107 is a term in the sequence, since 107_10=1223_4, and 223_4, 23_4 and 3_4 (43_10, 11_10, and 3_10) are all prime. %Y A279956 Cf. A278454 for base 2, A278694 for base 3, A278698 for base 5, and A033664 for base 10. %Y A279956 Also, cf. A278699 for base 4, where the final suffix cannot be 1 (it must be a prime, i.e., 2 or 3). %K A279956 nonn,base %O A279956 1,1 %A A279956 _Randy L. Ekl_, Dec 23 2016