A063885 - OEIS

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A063885

z(sigma(n)) = 2n, where z(n) = A048146.

24, 1536, 1631, 47360, 82458 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	PROG	`(PARI) u(n) = sumdiv(n, d, if(gcd(d, n/d)==1, d)); z(n) = sigma(n)-u(n); for(n=1, 10^7, if(z(sigma(n))==2*n, print(n)))`
	CROSSREFS	`Cf. A000203, A034448, A048146, A019284.` `Sequence in context: A099060 A035174 A203973 * A019284 A112389 A187634` `Adjacent sequences: A063882 A063883 A063884 * A063886 A063887 A063888`
	KEYWORD	`more,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Aug 28 2001`

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Last modified February 14 16:57 EST 2012. Contains 205635 sequences.