OFFSET
1,4
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..150
EXAMPLE
The a(42) = 9 integer partitions:
(42)
(21,14,7)
(18,9,9,6)
(18,9,9,3,3)
(20,10,4,4,4)
(12,12,12,4,2)
(10,5,5,5,5,5,5,2)
(12,6,6,4,4,4,2,2,2)
(6,6,4,4,4,4,3,3,3,3,2)
MATHEMATICA
Table[Length[Select[IntegerPartitions[n], IntegerQ[1/Total[#^(-2)]]&]], {n, 30}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Aug 29 2018
EXTENSIONS
a(61)-a(80) from Giovanni Resta, Sep 03 2018
STATUS
approved