1,1

Table of n, a(n) for n=1..55.

a(2)=18 because 18 is the second abundant number which on reversing its digits gives a deficient number, namely 81.

Cf. A005100, A005101.

Sequence in context: A072357 A054753 A098899 * A181487 A091191 A259980

Adjacent sequences: A098767 A098768 A098769 * A098771 A098772 A098773

easy,nonn,base

Shyam Sunder Gupta, Oct 02 2004

Edited by N. J. A. Sloane at the suggestion of Andrew S. Plewe, May 21 2007

approved