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A076286 Numbers of the form (7^{mr}-1)/(7^r-1) for positive integers m, r. 1
1, 8, 50, 57, 344, 400, 2402, 2451, 2801, 16808, 19608, 117650, 117993, 120100, 137257, 823544, 960800, 5764802, 5767203, 5884901, 6725601, 40353608, 40471600, 47079208, 282475250, 282492057, 288360150, 329554457, 1977326744, 2306881200, 13841287202 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

REFERENCES

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

Sequence in context: A043398 A038481 A043015 * A133426 A163228 A033463

Adjacent sequences:  A076283 A076284 A076285 * A076287 A076288 A076289

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Nov 06 2002

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.