1,2

a(1) = 1: d(1) = {1}. . a(2) = 12: d(12) = {1, 2, 3, 4, 6, 12}. . a(3) = 124: d(124) = {1, 2, 4, 31, 62, 124}. . a(4) = 135: d(135) = {1, 3, 5, 9, 15, 45, 135}.

Table of n, a(n) for n=1..8.

Sequence in context: A071269 A061088 A176556 * A173578 A291065 A273586

Adjacent sequences: A175249 A175250 A175251 * A175253 A175254 A175255

nonn,base

Jaroslav Krizek, Mar 14 2010

approved