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

36, 2296, 344224, 66795904, 2123921902809088, 55917383475391234048, 113139095670780538912768, 18936964716073275231635792697644548096, 17844842231875188005737387074890396164121166838056340379818586412691750912

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.

Formula

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

Example

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

Mathematica

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

Crossrefs

Cf. A000396, A133019, A135624.

Sequence in context: A065782 A374393 A160482 * A064566 A230465 A120466

Adjacent sequences: A135623 A135624 A135625 * A135627 A135628 A135629

Keyword

base,nonn

Author

Omar E. Pol, Feb 20 2008

Extensions

More terms from R. J. Mathar, Jun 24 2009

Status

approved