OFFSET
0,4
COMMENTS
Partial sums of A099773.
FORMULA
G.f.: (1/(1 - x))*Product_{k>=2} 1/(1 - x^prime(k)).
EXAMPLE
a(6) = 4 because we have [5, 1], [3, 3], [3, 1, 1, 1] and [1, 1, 1, 1, 1, 1].
MATHEMATICA
nmax = 62; CoefficientList[Series[1/(1 - x) Product[1/(1 - x^Prime[k]), {k, 2, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jan 22 2018
STATUS
approved