A115894 Numbers k such that phi(k)*prime(k) is a palindrome.

1, 2, 5, 16, 534, 7412, 17280, 146533, 633932, 1424705, 5879645

Offset: 1

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Examples

			phi(17280)*prime(17280) = 4608*191461 = 882252288.
		

Crossrefs

Cf. A084122, A115891, A115893.

Programs

Mathematica

pppQ[n_]:=Module[{c=IntegerDigits[EulerPhi[n]Prime[n]]},c == Reverse[c]]; Select[Range[6000000],pppQ] (* Harvey P. Dale, Aug 01 2012 *)