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A076285 Numbers of the form (6^{mr}-1)/(6^r-1) for positive integers m, r. 8
1, 7, 37, 43, 217, 259, 1297, 1333, 1555, 7777, 9331, 46657, 46873, 47989, 55987, 279937, 335923, 1679617, 1680913, 1727605, 2015539, 10077697, 10124569, 12093235, 60466177, 60473953, 62193781, 72559411, 362797057, 435356467, 2176782337, 2176828993, 2178463249 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..9380

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((6^(m+r)-1)/(6^r-1), r = sort(convert(numtheory:-divisors(m), list), `>`)), m=0..15); # Robert Israel, May 02 2018

CROSSREFS

Sequence in context: A141159 A092475 A106924 * A077720 A235463 A127313

Adjacent sequences:  A076282 A076283 A076284 * A076286 A076287 A076288

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 06 2002

STATUS

approved

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Last modified September 27 08:39 EDT 2021. Contains 347689 sequences. (Running on oeis4.)