A022944 a(n) = a(n-2) + c(n-1) for n >= 3, a( ) increasing, given a(1)=2, a(2)=4; where c( ) is complement of a( ).

2, 4, 5, 10, 12, 18, 21, 29, 34, 43, 49, 59, 66, 78, 86, 100, 109, 124, 134, 150, 161, 178, 191, 209, 223, 242, 258, 278, 295, 316, 334, 356, 375, 398, 419, 443, 465, 490, 513, 540, 564, 592, 617, 646, 672, 702, 729, 760, 789, 821, 851, 884, 915

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Links

• Ivan Neretin, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A005228 and references therein.

Programs

Mathematica

Fold[Append[#1, #1[[-2]] + Complement[Range[Max@#1 + 2], #1][[#2]]] &, {2, 4}, Range[2, 52]] (* Ivan Neretin, Apr 05 2016 *)