id:A115448 - OEIS Search Results

Search: id:A115448

Displaying 1-1 of 1 results found.

page 1

Numbers n such that phi(n)=sigma(phi(phi(n))).

+0
1

1, 2, 29, 58, 1119, 1492, 2238, 20441, 20803, 40882, 41606, 550339, 550687, 552407, 553339, 557239, 568487, 573319, 579367, 581279, 584039, 589399, 593959, 644959, 646303, 653317, 655879, 669599, 676837, 823311, 823527, 826599, 829233, 830199 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`lst={}; Do[u = EulerPhi@n; If[u == DivisorSigma[1, EulerPhi@u], AppendTo[lst, n]], {n, 10^6}]; lst`
	CROSSREFS	`Sequence in context: A105893 A059799 A142969 this_sequence A107161 A041097 A067071` `Adjacent sequences: A115445 A115446 A115447 this_sequence A115449 A115450 A115451`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 22 2006`

page 1

Search completed in 0.002 seconds

Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

AT&T Labs Research