A308221 Number of Egyptian fractions of denominator n which are sum of 3 unit fractions.

3, 6, 8, 11, 11, 16, 13, 19, 19, 22, 16, 29, 18, 26, 29, 31, 21, 38, 22, 41, 37, 32, 25, 51, 33, 36, 41, 49, 27, 58, 28, 51, 44, 42, 49, 69, 28, 45, 51, 71, 31, 74, 32, 61, 69, 48, 36, 87, 48, 67, 58, 68, 36, 82, 66, 85, 62, 54, 41, 109, 33, 57, 86, 82, 69, 89, 40, 80, 71, 98, 44, 121, 38, 59, 91, 84, 77, 101, 46, 118, 81, 62, 52, 139, 79, 65, 79, 106, 49, 138, 80, 89, 77, 70, 83, 143, 47, 98, 107, 128

Offset: 1

Author

Cyril Banderier, May 15 2019

Keywords

• nonn

Examples

			There are a(1) = 3 Egyptian fractions with denominator n = 1 which are sums of 3 unit fractions: 1/1 = 1/3 + 1/3 + 1/3, 2/1 = 1/1 + 1/2 + 1/2, and 3/1 = 1/1 + 1/1 + 1/1.
		

Links

• Cyril Banderier, Florian Luca, Francesco Pappalardi, Numerators of Egyptian fractions, 2019.

Crossrefs

Cf. A308219, A308220, A308415