A194429 - OEIS

%I #9 Jan 08 2025 10:41:48

%S 110,120,121,130,131,132,140,141,142,143,150,151,152,153,154,160,161,

%T 162,163,164,165,170,171,172,173,174,175,176,180,181,182,183,184,185,

%U 186,187,190,191,192,193,194,195,196,197,198,220,230,231,240,241,242,250,251,252,253,260,261,262,263,264,270,271,272,273,274,275,280,281

%N Numbers n such that there is no i >= 0 for which A053392(i) = n.

%C 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.

%H Erich Friedman, <a href="https://erich-friedman.github.io/mathmagic/0200.html">Problem of the Month (February 2000)</a>.

%Y Cf. A053392.

%K nonn,base

%O 1,1

%A _N. J. A. Sloane_, Aug 24 2011