A211126 One of 17 possible sets of eleven numbers of the form 3^alpha 5^beta 7^gamma whose sum of reciprocals is 1.

3, 5, 7, 9, 15, 21, 25, 27, 105, 135, 225

Offset

1,1

References

Burshtein, Nechemia. All the solutions of the equation Sum_{i=1..11}} 1/x_i = 1 in distinct integers of the form x_i = 3^alpha 5^beta 7^gamma. Discrete Math. 308 (2008), no. 18, 4286--4292. MR2427761 (2009e:11061)

Links

Table of n, a(n) for n=1..11.

Crossrefs

The 17 solutions are given in A211118-A211134. Cf. A201643, A201644, A201646, A201647, A201648, A201649.

Sequence in context: A211130 A211118 A211121 * A135553 A211125 A211124

Adjacent sequences: A211123 A211124 A211125 * A211127 A211128 A211129

Keyword

nonn,fini,full

Author

N. J. A. Sloane, Apr 02 2012

Status

approved