A167209 a(0) = 0; for n>=0, a(n+1) = a(n) + x where x is the smallest nonnegative number which is not equal to a(i) +/- a(k) or a(i)/2 for any 0<=i<=n, 0<=k<=n.

0, 1, 4, 10, 17, 29, 44, 67, 91, 117, 148, 180, 215, 251, 288, 329, 371, 420, 471, 523, 576, 631, 687, 746, 806, 870, 935, 1004, 1074, 1146, 1221, 1297, 1376, 1456, 1538, 1623, 1709, 1802, 1896, 1993, 2092, 2194, 2300, 2409, 2519, 2631, 2753, 2876, 3001, 3127, 3255, 3385, 3518, 3655, 3796, 3939

Offset: 0

Author

N. J. A. Sloane, Sep 03 2014

Keywords

• nonn

Comments

A maximal expulsion set of natural numbers.

Note that this definition is different from that of A047699.

Links

• Rémy Sigrist, Table of n, a(n) for n = 0..10000
• K. S. Brown, Expulsion Sets
• Rémy Sigrist, C program for A167209

Crossrefs

Cf. A169799, A169820, A047699.

Programs

C

See Links section.

Extensions

Initial value changed to a(0)=0 by N. J. A. Sloane, Feb 18 2019 (otherwise the definition did not match the terms).