id:A157848 - OEIS Search Results

Search: id:A157848

Displaying 1-1 of 1 results found.

page 1

Numbers k such that are arithmetic means of divisors of arithmetic numbers (arithmetic numbers is A003601)and equal to one of the divisors of this arithmetic numbers.

+0
1

1, 3, 28, 45, 84, 182, 270, 620, 546, 1, 240, 1, 330, 1, 638, 1, 260, 1, 365, 2, 660, 8, 128, 6, 200, 6, 200, 6, 944, 8, 190, 9, 310, 7, 560, 8, 190, 18, 600, 15, 120, 18, 620, 16, 380 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n)=sigma(A007340(n))/tau(A007340(n))=A000203((A007340(n))/A000005(A007340(n)).`
	EXAMPLE	`a(3) = 28, because 28 is arithmetic mean of divisors of A007340(3)=140 and also is divisor of 140.`
	CROSSREFS	`Cf. A000203, A007340, A000005.` `Sequence in context: A037102 A042169 A041785 this_sequence A046104 A116984 A061793` `Adjacent sequences: A157845 A157846 A157847 this_sequence A157849 A157850 A157851`
	KEYWORD	`nonn`
	AUTHOR	`Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Mar 07 2009, Mar 09 2009`

page 1

Search completed in 0.002 seconds

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

AT&T Labs Research