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A076270 Numbers of the form (3^{mr}-1)/(3^r-1) for positive integers m, r. 9
1, 4, 10, 13, 28, 40, 82, 91, 121, 244, 364, 730, 757, 820, 1093, 2188, 3280, 6562, 6643, 7381, 9841, 19684, 20440, 29524, 59050, 59293, 66430, 88573, 177148, 265720, 531442, 532171, 538084, 551881, 597871, 797161, 1594324, 2391484, 4782970, 4785157, 5380840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..41.

T. Chinburg and M. Henriksen, Sums of k-th powers in the ring of polynomials with integer coefficients, Acta Arithmetica, 29 (1976), 227-250.

MAPLE

f := proc(p) local m, r, t1; t1 := {}; for m from 1 to 10 do for r from 1 to 10 do t1 := {op(t1), (p^(m*r)-1)/(p^r-1)}; od: od: sort(convert(t1, list)); end; f(3); # very crude!

CROSSREFS

Cf. A064896 (k=2), A076270 (k=3), A076275 (k=4), A076284 (k=5), A076286 (k=7), A076287 (k=8), A076288 (k=9), A076289 (k=10).

Sequence in context: A191107 A173931 A173793 * A032821 A101576 A179134

Adjacent sequences:  A076267 A076268 A076269 * A076271 A076272 A076273

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 06 2002

STATUS

approved

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Last modified December 10 03:42 EST 2016. Contains 278993 sequences.