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 A330745 Primorial deflation of A019505(n), where A019505(n) is smallest number with same number of divisors as 2*A019505(n-1), starting from A019505(1) = 1. 2
 1, 2, 4, 3, 6, 12, 24, 10, 20, 40, 30, 60, 21, 42, 84, 168, 336, 66, 132, 264, 528, 396, 792, 117, 234, 468, 936, 1872, 780, 1560, 612, 1224, 2448, 1020, 2040, 684, 1368, 2736, 1140, 2280, 4560, 1596, 3192, 1380, 2760, 5520, 1932, 3864, 7728, 15456, 11592, 23184, 1827, 3654, 7308, 14616, 29232, 1953, 3906, 7812, 15624, 31248, 62496 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(n) is the unique integer k such that A108951(k) = A019505(n). Conjectured to be a subsequence of A329902. Terms computed from b-file of A019505 provided by R. J. Mathar. LINKS FORMULA a(n) = A329900(A019505(n)). PROG (PARI) A330745(n) = A329900(A019505(n)); CROSSREFS Cf. A019505, A108951, A329900, A329902. Cf. A330744 (conjectured subsequence). Sequence in context: A101278 A329902 A091274 * A122525 A054589 A051851 Adjacent sequences:  A330742 A330743 A330744 * A330746 A330747 A330748 KEYWORD nonn AUTHOR Antti Karttunen, Jan 10 2020 STATUS approved

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Last modified May 16 11:54 EDT 2021. Contains 343942 sequences. (Running on oeis4.)