id:A019445 - OEIS Search Results

Search: id:A019445

Displaying 1-1 of 1 results found.

page 1

A019445

Form a permutation of the positive integers, p_1, p_2, ..., such that the average of each initial segment is an integer, using the greedy algorithm to define p_n; sequence gives p_1+..+p_n.

+0
4

1, 4, 6, 12, 20, 24, 35, 40, 54, 70, 77, 96, 117, 126, 150, 160, 187, 216, 228, 260, 273, 308, 345, 360, 400, 442, 459, 504, 522, 570, 620, 640, 693, 748, 770, 828, 851, 912, 975, 1000, 1066, 1092, 1161, 1232, 1260, 1334, 1410, 1440, 1519, 1550 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`It appears that a(n) is divisible by n. - Michael Somos Jan 29 2004` `A168560(n) = a(n)/n [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 29 2009]`
	LINKS	`Problem of the week, Web site - problem 818`
	CROSSREFS	`Cf. A019444, A019446.` `Sequence in context: A045956 A057339 A160856 this_sequence A119638 A110935 A128034` `Adjacent sequences: A019442 A019443 A019444 this_sequence A019446 A019447 A019448` `Cf. A168560 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 29 2009]`
	KEYWORD	`nonn,new`
	AUTHOR	`R. K. Guy, Tom Halverson (halverson(AT)macalester.edu)`

page 1

Search completed in 0.002 seconds

Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

AT&T Labs Research