id:A019505 - OEIS Search Results

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A019505

a(n) is smallest number with same number of factors as 2*a(n-1).

+0
6

1, 2, 4, 6, 12, 24, 48, 60, 120, 240, 360, 720, 1260, 2520, 5040, 10080, 20160, 27720, 55440, 110880, 221760, 332640, 665280, 1081080, 2162160, 4324320, 8648640, 17297280, 21621600, 43243200, 73513440, 147026880, 294053760, 367567200, 735134400, 1396755360, 2793510720 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`R. J. Mathar, Table of n, a(n) for n = 1..63`
	EXAMPLE	`After a(3)=4 we argue as follows: 2*4 = 8 has 4 factors (1,2,4,8), but smallest number with 4 factors is 6, so a(4)=6.`
	CROSSREFS	`Every term is also in A002182. Cf. A020697.` `Adjacent sequences: A019502 A019503 A019504 this_sequence A019506 A019507 A019508` `Sequence in context: A068010 A095848 A136339 this_sequence A135614 A115387 A095849`
	KEYWORD	`nonn`
	AUTHOR	`J. Lowell (jhbubby(AT)avana.net)`

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.

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