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 A076284 Numbers of the form (5^{mr}-1)/(5^r-1) for positive integers m, r. 7
 1, 6, 26, 31, 126, 156, 626, 651, 781, 3126, 3906, 15626, 15751, 16276, 19531, 78126, 97656, 390626, 391251, 406901, 488281, 1953126, 1968876, 2441406, 9765626, 9768751, 10172526, 12207031, 48828126, 61035156, 244140626, 244156251, 244531876, 246109501 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..34. T. Chinburg and M. Henriksen, Sums of k-th powers in the ring of polynomials with integer coefficients, Acta Arithmetica, 29 (1976), 227-250. CROSSREFS Cf. A064896 (k=2), A076270 (k=3), A076275 (k=4), A076285 (k=6), A076286 (k=7), A076287 (k=8), A076288 (k=9), A076289 (k=10). Sequence in context: A045225 A038474 A043006 * A177220 A157353 A271311 Adjacent sequences: A076281 A076282 A076283 * A076285 A076286 A076287 KEYWORD nonn AUTHOR N. J. A. Sloane, Nov 06 2002 STATUS approved

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Last modified September 27 07:34 EDT 2023. Contains 365674 sequences. (Running on oeis4.)