A039304 - OEIS

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A039304

Number of distinct quadratic residues mod 7^n.

1, 4, 22, 151, 1051, 7354, 51472, 360301, 2522101, 17654704, 123582922, 865080451, 6055563151, 42388942054, 296722594372, 2077058160601, 14539407124201, 101775849869404, 712430949085822, 4987016643600751, 34909116505205251 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Number of distinct n-digit suffixes of base 7 squares.`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 0..200`
	FORMULA	`a(n) = floor( (7^n+3)*7/16 ).`
	PROG	`(MAGMA) [Floor((7^n+3)*7/16): n in [0..25]]; // Vincenzo Librandi, May 14 2011`
	CROSSREFS	`Sequence in context: A112898 A111529 A189845 * A152404 A062817 A196275` `Adjacent sequences: A039301 A039302 A039303 * A039305 A039306 A039307`
	KEYWORD	`nonn,easy`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified February 15 14:02 EST 2012. Contains 205811 sequences.