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 A339556 #9 Feb 16 2025 08:34:01
%S A339556 1,2,3,4,5,6,11,16,19,30,41,54,69,106,177,272,397,686,1299,2416,4225,
%T A339556 7196,11701,20352,36305,70134,132721,248722,473391,894318,1674923,
%U A339556 3054022,5452067,9626552,16696543,29086462,51830095,96887612,192393735,397875694
%N A339556 Number of subsets of the first n primes whose elements have a prime root-mean-square.
%H A339556 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Root-Mean-Square.html">Root-Mean-Square</a>
%e A339556 a(7) = 11 subsets: {2}, {3}, {5}, {7}, {11}, {13}, {17}, {7, 17}, {5, 7, 17}, {7, 13, 17} and {5, 7, 11, 17}.
%Y A339556 Cf. A000040, A071810, A127542, A163974, A309160, A339454, A339485.
%K A339556 nonn
%O A339556 1,2
%A A339556 _Ilya Gutkovskiy_, Dec 08 2020
%E A339556 a(10)-a(40) from _Alois P. Heinz_, Dec 08 2020