A374582 a(n) = number of Egyptian fractions 1 = 1/x_1 + ... + 1/x_n such that 1 <= x_1 <= ... <= x_n and x_k | x_n for all k = 1..n.

1, 1, 3, 12, 97, 1568, 76309, 16993752

Offset

1,3

Links

Table of n, a(n) for n=1..8.

Crossrefs

Cf. A002966, A156871, A374583.

Sequence in context: A078124 A115245 A145074 * A162055 A067300 A133359

Adjacent sequences: A374579 A374580 A374581 * A374583 A374584 A374585

Keyword

nonn,more,hard

Author

Max Alekseyev, Jul 12 2024

Status

approved