id:A140635 - OEIS Search Results

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Smallest positive integer having the same number of divisors as n.

+0
6

1, 2, 2, 4, 2, 6, 2, 6, 4, 6, 2, 12, 2, 6, 6, 16, 2, 12, 2, 12, 6, 6, 2, 24, 4, 6, 6, 12, 2, 24, 2, 12, 6, 6, 6, 36, 2, 6, 6, 24, 2, 24, 2, 12, 12, 6, 2, 48, 4, 12, 6, 12, 2, 24, 6, 24, 6, 6, 2, 60, 2, 6, 12, 64, 6, 24, 2, 12, 6, 24, 2, 60, 2, 6, 12, 12, 6, 24, 2, 48, 16, 6, 2, 60, 6, 6, 6, 24, 2 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n)<=n for all n. Moreover, a(n)=n if and only if n belongs to A005179.`
	FORMULA	`a(n) = A005179(A000005(n))`
	CROSSREFS	`Cf. A000005, A005179, A139770.` `Cf. A019505, A138113, A061300 (sequences that can be defined in terms of this sequence).` `Sequence in context: A073348 A122457 A139770 this_sequence A002322 A127835 A117004` `Adjacent sequences: A140632 A140633 A140634 this_sequence A140636 A140637 A140638`
	KEYWORD	`nonn`
	AUTHOR	`Max Alekseyev (maxal(AT)cs.ucsd.edu), May 19 2008`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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