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A138654 7^n mod 4^n. 1
0, 3, 1, 23, 97, 423, 2961, 4343, 63169, 245575, 408305, 1809559, 84001, 50919655, 155110993, 548906039, 2768600449, 15085235847, 36877174193, 258140219351, 707469907681, 2753266098215, 10476769665297, 20560829523831, 73557062489153, 233424460713415 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

MATHEMATICA

Table[PowerMod[7, n, 4^n], {n, 0, 30}] (* Harvey P. Dale, Aug 26 2019 *)

CROSSREFS

Sequence in context: A271605 A270220 A281377 * A175289 A072271 A309397

Adjacent sequences:  A138651 A138652 A138653 * A138655 A138656 A138657

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 20 2008

STATUS

approved

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Last modified September 21 13:37 EDT 2019. Contains 327253 sequences. (Running on oeis4.)