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 A076287 Numbers of the form (8^{mr}-1)/(8^r-1) for positive integers m, r. 8
 1, 9, 65, 73, 513, 585, 4097, 4161, 4681, 32769, 37449, 262145, 262657, 266305, 299593, 2097153, 2396745, 16777217, 16781313, 17043521, 19173961, 134217729, 134480385, 153391689, 1073741825, 1073774593, 1090785345, 1227133513, 8589934593, 9817068105 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Numbers which in base 8 contain only 0's and 1's, with equally spaced 1's. - Robert Israel, Jan 15 2019 LINKS Robert Israel, Table of n, a(n) for n = 1..7932 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 1, seq(seq((8^(k+r)-1)/(8^r-1), r = ListTools:-Reverse(sort(convert(numtheory:-divisors(k), list)))), k=1..20); # Robert Israel, Jan 15 2019 CROSSREFS Cf. A064896 (k=2), A076270 (k=3), A076275 (k=4), A076284 (k=5), A076285 (k=6), A076286 (k=7), A076288 (k=9), A076289 (k=10). Sequence in context: A043426 A038484 A043021 * A339997 A226929 A212668 Adjacent sequences: A076284 A076285 A076286 * A076288 A076289 A076290 KEYWORD nonn AUTHOR N. J. A. Sloane, Nov 06 2002 STATUS approved

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Last modified December 1 23:26 EST 2023. Contains 367503 sequences. (Running on oeis4.)