OFFSET
1,4
EXAMPLE
The a(12) = 9 partitions:
(66),
(444), (441111),
(3333), (33111111),
(222222), (222111111), (2211111111),
(111111111111).
MATHEMATICA
Table[Length[Select[IntegerPartitions[n], And[GCD@@Sort[Length/@Split[#]]>1, GCD@@Length/@Split[Sort[Length/@Split[#]]]==1]&]], {n, 30}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Sep 12 2018
STATUS
approved