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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. 2
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; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It appears that a(n) is divisible by n. - Michael Somos, Jan 29 2004

LINKS

Table of n, a(n) for n=1..50.

Problem of the week, Web site - problem 818

FORMULA

Partial sums of A019444. - Sean A. Irvine, Mar 17 2019

CROSSREFS

Cf. A019444, A019446.

Sequence in context: A045956 A057339 A160856 * A119638 A178547 A168674

Adjacent sequences:  A019442 A019443 A019444 * A019446 A019447 A019448

KEYWORD

nonn

AUTHOR

R. K. Guy, Tom Halverson (halverson(AT)macalester.edu)

STATUS

approved

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Last modified May 27 21:52 EDT 2020. Contains 334671 sequences. (Running on oeis4.)