id:A063798 - OEIS Search Results

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phi(s(n^3)) is a square, where s(n) is sigma(n)-n (A001065).

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4, 7, 9, 61, 73, 81, 121, 144, 431, 727, 919, 1596, 2413, 2593, 2809, 3966, 6561, 6827, 9551, 10593, 12791, 17053, 29959, 31238, 33791, 45115, 47051, 76157, 79898, 85607, 140891, 148151, 192887, 203843, 212461, 311293, 381739, 397259 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) s(n) = sigma(n)-n; for(n=2, 10^6, if(issquare(eulerphi(s(n^3))), print(n)))`
	CROSSREFS	`Cf. A001065.` `Sequence in context: A121865 A103073 A022541 this_sequence A084035 A103702 A118517` `Adjacent sequences: A063795 A063796 A063797 this_sequence A063799 A063800 A063801`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Aug 19 2001`
	EXTENSIONS	`More terms from Dean Hickerson, Aug 22 2001`

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Last modified November 30 22:12 EST 2008. Contains 150989 sequences.

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