1,1

The Friedman web site quotes B. J. van der Zwaag as saying that the three-digit terms are those for which the middle digit is >= the sum of the other two digits.

Table of n, a(n) for n=1..68.

Erich Friedman, Problem of the Month (February 2000).

Cf. A053392.

Sequence in context: A279421 A135642 A166323 * A320121 A084042 A110735

Adjacent sequences: A194426 A194427 A194428 * A194430 A194431 A194432

nonn,base

N. J. A. Sloane, Aug 24 2011

approved