A347569 Number of ways 1/n can be expressed as the sum of six distinct unit fractions: 1/n = 1/p + 1/q + 1/r + 1/s + 1/t + 1/u, with 0 < p < q < r < s < t < u.

2320, 244817, 3421052, 18420699, 64025680, 131223239, 431008820, 681922142

Offset: 1

Author

Jud McCranie, Sep 06 2021

Keywords

• nonn
• hard
• more

Crossrefs

Cf. A002966, A073546, A227610, A241883, A347566.

Extensions

a(7) and a(8) from Jud McCranie, Oct 15 2021