A363457 Positions of products of distinct primorial numbers (A129912) in the sequence of products of primorial numbers (A025487).

1, 2, 4, 6, 9, 13, 20, 22, 27, 29, 43, 54, 55, 66, 72, 89, 93, 112, 114, 123, 140, 147, 150, 175, 186, 223, 232, 242, 246, 274, 279, 285, 290, 332, 371, 376, 425, 433, 439, 442, 488, 500, 518, 535, 539, 570, 619, 624, 656, 718, 747, 761, 783, 789, 816, 831, 860

Offset

1,2

Comments

Numbers k such that A025487(k) is a term of A129912.

Numbers k such that A051282(k) = A363455(k).

What is the asymptotic behavior of this sequence? Empirically, it seems that a(n) ~ A * n^c, where A and c are constants.

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Formula

A025487(a(n)) = A129912(n).

Mathematica

lps = Cases[Import["https://oeis.org/A025487/b025487.txt", "Table"], {_, _}][[;; , 2]];
prod = Cases[Import["https://oeis.org/A129912/b129912.txt", "Table"], {_, _}][[;; , 2]];
Position[lps, #] & /@ prod // Flatten

Crossrefs

Cf. A002110, A025487, A051282, A129912, A363455.

Sequence in context: A039902 A081659 A143586 * A344677 A241546 A370320

Adjacent sequences: A363454 A363455 A363456 * A363458 A363459 A363460

Keyword

nonn

Author

Amiram Eldar, Jun 03 2023

Status

approved