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 A308710 #33 Jun 19 2023 17:08:23 %S A308710 6,20,28,88,104,272,304,368,464,496,1184,1312,1376,1504,1696,1888, %T A308710 1952,4288,4544,4672,5056,5312,5696,6208,6464,6592,6848,6976,7232, %U A308710 8128,16768,17536,17792,19072,19328,20096,20864,21376,22144,22912,23168,24448,24704,25216 %N A308710 Primitive practical numbers of the form 2^i * prime(k). %C A308710 Intersection of A267124 and A100368. %C A308710 a(n) is a number of the form 2^i * prime(k) for i > 0 and A007053(i) < k <= A007053(i+1). %C A308710 Terms are pseudoperfect numbers, A005835 and are also primitive pseudoperfect numbers, A006036. %H A308710 Amiram Eldar, <a href="/A308710/b308710.txt">Table of n, a(n) for n = 1..10000</a> %F A308710 a(n) = 2^floor(log_2(prime(n+1))) * prime(n+1). %t A308710 a[n_] := (p = Prime[n+1]) * 2^Floor[Log2[p]]; Array[a, 50] (* _Amiram Eldar_, Sep 22 2019 *) %o A308710 (PARI) isok(n) = is_A100368(n) && is_A267124(n); \\ _Michel Marcus_, Jun 19 2019 %Y A308710 Cf. A000040, A000079, A005153, A005835, A006036, A007053, A100368, A267124. %K A308710 nonn %O A308710 1,1 %A A308710 _Miko Labalan_, Jun 19 2019