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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A135626 Product of n-th perfect number and n-th perfect number written backwards.

Original entry on oeis.org

36, 2296, 344224, 66795904, 2123921902809088, 55917383475391234048, 113139095670780538912768, 18936964716073275231635792697644548096, 17844842231875188005737387074890396164121166838056340379818586412691750912
Offset: 1

Views

Author

Omar E. Pol, Feb 20 2008

Keywords

Examples

			a(2)=2296 because the second perfect number is 28 and 28*82=2296.

Links

Crossrefs

Cf. A000396, A133019, A135624.

Programs

  • Mathematica
    # IntegerReverse[#]&/@PerfectNumber[Range[10]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Nov 29 2020 *)

Formula

a(n) = A000396(n)*A135624(n).

Extensions

More terms from R. J. Mathar, Jun 24 2009
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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