cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-1 of 1 results.

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

Original entry on oeis.org

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

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

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 *)
Showing 1-1 of 1 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.