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 A086688 #19 Sep 06 2024 08:06:37 %S A086688 4,9,30,68,217,327,656,882,1457,2707,3228,5194,6850,7789,9916,13746, %T A086688 18411,20179,26062,30597,32984,40991,46959,56924,72217,80725,85182, %U A086688 94695,99669,110127,152280,165951,187910,195660,237427,246434,274614 %N A086688 Number of primes < prime(n)^3. %H A086688 Amiram Eldar, <a href="/A086688/b086688.txt">Table of n, a(n) for n = 1..10000</a> %F A086688 a(n) = A038098(prime(n)). - _R. J. Mathar_, Sep 15 2012 %F A086688 a(n) = A000720(A030078(n)). - _Michel Marcus_, Sep 18 2023 %t A086688 a[n_] := PrimePi[Prime[n]^3]; Array[a, 50] (* _Amiram Eldar_, Sep 06 2024 *) %o A086688 (PARI) a(n) = primepi(prime(n)^3); \\ _Michel Marcus_, Sep 18 2023 %Y A086688 Cf. A000720, A030078, A038098. %K A086688 easy,nonn %O A086688 1,1 %A A086688 _Cino Hilliard_, Jul 28 2003