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A096903 Least integer of each ordered prime signature (A055932) arranged by prime signature (each row starting with least integer of each prime signature, A025487). 3
1, 2, 4, 6, 8, 12, 18, 16, 24, 54, 30, 32, 36, 48, 162, 60, 90, 150, 64, 72, 108, 96, 486, 120, 270, 750, 128, 144, 324, 180, 300, 450, 192, 1458, 210, 216, 240, 810, 3750, 256, 288, 972, 360, 540, 600, 1350, 1500, 2250, 384, 4374, 420, 630, 1050, 1470, 432, 648 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
There are several other sequences closely related to a(n). A066099 and A108244 both list the associated exponents, while A108730 provides an elegant mapping to binary representations. - Alford Arnold, Mar 05 2006
LINKS
Michael De Vlieger, Table of n, a(n) for n = 0..14264 (rows 0 <= n <= 487 = A098719(9) - 1.)
EXAMPLE
Sequence begins
1,
2,
4,
6,
8,
12,18,
16,
24,54,
30,
32,
36,
48,162,
60,90,150
MATHEMATICA
SortBy[#, First] &@ Map[Union@ Map[Times @@ MapIndexed[Prime[First@ #2]^#1 &, #] &, Permutations[#]] &, Map[If[# == 1, {0}, Function[f, ReplacePart[Table[0, {PrimePi[f[[-1, 1]]]}], #] &@ Map[PrimePi@ First@ # -> Last@ # &, f]]@ FactorInteger@ #] &, Import["https://oeis.org/A025487/b025487.txt", "Data"][[1 ;; 30, -1]] ] ] // Flatten (* Michael De Vlieger, Feb 06 2020, using b-file from A025487 *)
CROSSREFS
Sequence in context: A168657 A240498 A081954 * A352107 A273457 A222603
KEYWORD
nonn,tabf
AUTHOR
Ray Chandler, Aug 01 2004
EXTENSIONS
Edited by Daniel Forgues, Jan 24 2011
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)