id:A053783 - OEIS Search Results

Search: id:A053783

Displaying 1-1 of 1 results found.

page 1

(1+e)-harmonic numbers: harmonic mean of (1+e)-divisors is integral.

+0
2

1, 6, 28, 140, 728, 1638, 2184, 3640, 8008, 8190, 10920, 18620, 23808, 23895, 27846, 37128, 47790, 55860, 69160, 148960, 166656, 189810, 237510, 242060, 316680, 334530, 359600, 406215, 446880, 484120, 525690, 669060, 726180, 1029952 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`If n = Product p(i)^r(i), d = Product p(i)^s(i) and s(i) = 0 or s(i) divides r(i), then d is a (1+e)-divisor of n.`
	CROSSREFS	`Cf. A001599, A049599, A051378.` `Sequence in context: A108051 A001599 A074247 this_sequence A110047 A163029 A045722` `Adjacent sequences: A053780 A053781 A053782 this_sequence A053784 A053785 A053786`
	KEYWORD	`easy,nonn`
	AUTHOR	`Naohiro Nomoto (6284968128(AT)geocities.co.jp), Apr 14 2001`

page 1

Search completed in 0.002 seconds

Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

AT&T Labs Research