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 A024623 #27 Dec 19 2019 02:31:39 %S A024623 1,3,8,16,33,69,153,360,894,2294,6060,16229,44126,121021,334771, %T A024623 931905,2608160,7333717,20703268,58652234,166684333,475034096, %U A024623 1357217584,3886575564,11152863757,32065004164,92349161271,266398439961,769616851854,2226457643329,6449248612381,18703413267318 %N A024623 a(n) is the number of prime powers <= 3^n. %C A024623 a(n) is the position of 3^n among the powers of primes (A000961). - _Robert G. Wilson v_, Dec 16 2019 %H A024623 David A. Corneth, <a href="/A024623/b024623.txt">Table of n, a(n) for n = 0..47</a> (calculated using the bfile in A055729) %F A024623 a(n) = A065515(3^n). - _Michel Marcus_, Dec 15 2019 %Y A024623 Cf. A000961 (powers of primes), A000244 (powers of 3), A055729, A065515. %K A024623 nonn %O A024623 0,2 %A A024623 _Clark Kimberling_ %E A024623 a(18)-a(31) from _Robert G. Wilson v_, Dec 15 2019