A027566 Number of numbers not of form k_1 k_2 .. k_n (1/k_1 + .. + 1/k_n), k_i >= 1.

1, 18, 126, 1652

Offset

2,2

Links

Table of n, a(n) for n=2..5.

Crossrefs

Cf. A025052, A027563, A027565, A027565.

Sequence in context: A056125 A223212 A297027 * A335781 A041620 A244879

Adjacent sequences: A027563 A027564 A027565 * A027567 A027568 A027569

Keyword

nonn,hard,nice

Author

R. H. Hardin

Status

approved