A090759 Numbers n which occur at least twice in A001600.

5, 13, 15, 17, 19, 24, 27, 29, 37, 44, 45, 46, 47, 49, 51, 53, 61, 73, 75, 85, 86, 87, 89, 91, 96, 97, 99, 101, 105, 107, 144, 145, 149, 168, 169, 171, 173, 176, 181, 184, 186, 187, 188, 189, 191, 195, 197, 203, 205, 224, 240, 245, 252, 264, 270, 272

Offset: 1

Author

R. K. Guy, Feb 08 2004

Keywords

• nonn

References

• T. Goto and S. Shibata, All numbers whose positive divisors have integral harmonic mean up to 300, Math. Comput. 73 (2004), 475-491.

Crossrefs

Cf. A001600, A090240.