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.

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A115893 Numbers k such that sigma(k)*prime(k) is a palindrome.

Original entry on oeis.org

1, 2, 5, 4813, 47619
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Comments

No additional terms up to 5*10^6. - Harvey P. Dale, Sep 14 2012

Examples

			sigma(47619)*prime(47619) = 82992*580477 = 48174947184.

Crossrefs

Cf. A084122, A115890, A115894.

Programs

  • Mathematica
    dspQ[n_]:=Module[{c=IntegerDigits[DivisorSigma[1,n]Prime[n]]},c == Reverse[c]]; Select[Range[50000],dspQ] (* Harvey P. Dale, Sep 14 2012 *)
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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