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

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

Offset

1,2

Links

Table of n, a(n) for n=1..11.

Example

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

Mathematica

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

Crossrefs

Cf. A084122, A115891, A115893.

Sequence in context: A357341 A037075 A358004 * A033835 A366609 A178198

Adjacent sequences: A115891 A115892 A115893 * A115895 A115896 A115897

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved