A033893 Sort then Add, a(1)=3.

3, 6, 12, 24, 48, 96, 165, 321, 444, 888, 1776, 3453, 6798, 13587, 27165, 39732, 63111, 74247, 98724, 123513, 235848, 470436, 504903, 508362, 531930, 545289, 790878, 868767, 1536555, 2892111, 4004400, 4004844, 4049292, 4273791, 5508570, 5564148, 7009716

Offset: 1

Author

N. J. A. Sloane and David W. Wilson

Keywords

• nonn
• base
• easy

Comments

a(n+1) is obtained by sorting the digits of a(n) into increasing order then adding this number to a(n).

Examples

			96 + 69 = 165.
		

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A033860.

Programs

Maple

A033893 := proc(n)
    option remember ;
    if n =1 then
        3;
    else
        A070196(procname(n-1)) ;
    end if;
end proc:
seq(A033893(n),n=1..100) ; # R. J. Mathar, Feb 03 2025