OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..2000
EXAMPLE
a(4) = 10 enumerates these subsets: {1}, {4}, {1,2}, {1,3}, {1,4}, {2,4}, {3,4}, {1,3,4}, {1,2,4}, {1,2,3,4}.
MATHEMATICA
Map[Length[Select[Map[Commonest, PrimeQ[Rest[Subsets[Range[#]]]]], # != {True} &]] &, Range[22]] (* Peter J. C. Moses, Jan 29 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Feb 03 2024
EXTENSIONS
a(23)-a(34) from Alois P. Heinz, Feb 03 2024
STATUS
approved