id:A063753 - OEIS Search Results

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Cototient(n) is a square and sets a new record for squares.

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2, 6, 21, 24, 54, 96, 189, 216, 345, 384, 420, 796, 864, 1332, 1536, 1680, 2340, 3300, 3780, 5328, 6144, 6516, 6720, 8260, 8484, 9360, 10500, 13200, 14532, 15120, 18340, 19476, 20580, 24576, 26064, 26628, 26880, 29700, 33396, 33936, 34020 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI)a=0; for(n=1, 7000, x=n-eulerphi(n); if(issquare(x), b=x; if(b>a, a=b; print(n))))`
	CROSSREFS	`Cf. A051953.` `Sequence in context: A074859 A103160 A126099 this_sequence A066893 A004192 A104143` `Adjacent sequences: A063750 A063751 A063752 this_sequence A063754 A063755 A063756`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Aug 11 2001`
	EXTENSIONS	`More terms from Dean Hickerson, Aug 22 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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