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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
Eric W. Weisstein, Nov 09, 2003