A379527 Number of compositions (ordered partitions) of 1 into {1/1, 1/3, 1/5, ..., 1/(2*n-1)}.

1, 2, 3, 4, 22, 23, 24, 5115, 5116, 5117, 1689273, 1689274, 441985160, 191869129330, 191869129331, 191869129332

Offset

1,2

Links

Table of n, a(n) for n=1..16.

Index entries for sequences related to Egyptian fractions.

Formula

If 2*n-1 is prime, then a(n) = a(n-1) + 1. - Chai Wah Wu, Dec 26 2024

Crossrefs

Cf. A005408, A020473, A038034, A378269.

Sequence in context: A081480 A070841 A069801 * A019074 A019075 A006709

Adjacent sequences: A379524 A379525 A379526 * A379528 A379529 A379530

Keyword

nonn,more

Author

Ilya Gutkovskiy, Dec 24 2024

Extensions

a(13)-a(16) from Chai Wah Wu, Dec 27 2024

Status

approved