1,2

The sequence of uban numbers first differs from A052406 (the numbers not containing the digit 4) at the term 40 (forty), which is a uban number but is not 4-less.

Table of n, a(n) for n=1..71.

Eric Weisstein's World of Mathematics, Uban Number

Cf. A006933, A052406, A089589.

Sequence in context: A023839 A004723 A242410 * A052406 A022306 A183298

Adjacent sequences: A089587 A089588 A089589 * A089591 A089592 A089593

nonn,easy,word

Eric W. Weisstein, Nov 09, 2003

approved