A116022 n*phi(n)*phi(phi(n)) is a palindrome.

1, 2, 3, 4, 309, 618, 9264, 43407

Offset: 1

Author

Giovanni Resta, Feb 13 2006

Keywords

• nonn
• base

Comments

No further terms up to 1 million. - Harvey P. Dale, Oct 04 2024

Examples

			43407*phi(43407)*phi(phi(43407)) = 6739855589376.
		

Crossrefs

Cf. A115891.

Programs

Mathematica

Select[Range[44000],PalindromeQ[# EulerPhi[#] EulerPhi[EulerPhi[#]]]&] (* Harvey P. Dale, Oct 04 2024 *)