A039783 phi(n) is equal to the product of the dual prime-power components of n-1 (i.e., A008477(n-1)).

5, 17, 51, 73, 109, 433, 17408, 21601, 121501, 1350001, 3294173, 9376762501

Offset: 1

Author

Olivier Gérard

Keywords

• nonn

Comments

a(13) > 3*10^10. - Donovan Johnson

Examples

			phi(17408) = 8192, 17407 = 13^2*103^1, (2^13)*(1^103) = 8192.
		

Crossrefs

Cf. A000010, A008477.

Extensions

More terms from Naohiro Nomoto, Jun 24 2001

a(12) from Donovan Johnson, Nov 14 2010