A064015 - OEIS

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A064015

Numbers n such that sopf(n)*nud(n)==pi(n), where sopf(n)=A008472, nud(n)=A034444 and pi(n)=A000720.

1, 8, 72, 135, 504, 726, 3431, 5313, 8614, 10249 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	PROG	`(PARI) nud(n) = 2^omega(n); pi(n) = s=0; for(x=1, n, if(isprime(x), s++)); s; sopf(n, s, fac, i)=fac=factor(n); for(i=1, matsize(fac)[1], s=s+fac[i, 1]); return(s); for(n=1, 10^6, if(sopf(n)*nud(n)==pi(n), print(n)))`
	CROSSREFS	`Cf. A008472, A034444, A000720.` `Sequence in context: A115693 A112403 A043932 * A044576 A104453 A143945` `Adjacent sequences: A064012 A064013 A064014 * A064016 A064017 A064018`
	KEYWORD	`more,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Sep 06 2001`

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.