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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A233465 Numbers n such that sigma(n) = reversal(2n).

Original entry on oeis.org

1259196, 1473381
Offset: 1

Views

Author

Farideh Firoozbakht, Mar 14 2014

Keywords

Comments

a(3) > 10^12. - Giovanni Resta, Mar 15 2014

Crossrefs

Cf. A000203, A004086, A233467.

Programs

  • Mathematica
    rev[n_] := FromDigits@ Reverse@ IntegerDigits@n; Select[Range[2*10^6], DivisorSigma[1, #] == rev[2*#] &] (* Giovanni Resta, Mar 15 2014 *)
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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