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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 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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