id:A003165 - OEIS Search Results

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Floor(n/2) + 1 - number of divisors of n.
(Formerly M0106)

+0
1

0, 0, 0, 0, 1, 0, 2, 1, 2, 2, 4, 1, 5, 4, 4, 4, 7, 4, 8, 5, 7, 8, 10, 5, 10, 10, 10, 9, 13, 8, 14, 11, 13, 14, 14, 10, 17, 16, 16, 13, 19, 14, 20, 17, 17, 20, 22, 15, 22, 20, 22, 21, 25, 20, 24, 21, 25, 26, 28, 19, 29, 28, 26, 26, 29, 26, 32, 29, 31, 28, 34, 25, 35, 34, 32 (list; graph; listen)

	OFFSET	`1,7`
	REFERENCES	`M. Newman, Integral Matrices. Academic Press, NY, 1972, p. 186.` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).`
	CROSSREFS	`Equals A004526(n) - A000005(n) + 1.` `Sequence in context: A046640 A049823 A143775 this_sequence A158379 A122838 A050378` `Adjacent sequences: A003162 A003163 A003164 this_sequence A003166 A003167 A003168`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`More terms from R. Stephan, Sep 18 2004`

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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.

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