OFFSET
1,11
COMMENTS
a(pi(A213721(n))) = n, where pi(n) is the prime counting function.
LINKS
Arkadiusz Wesolowski, Table of n, a(n) for n = 1..1000
EXAMPLE
a(11) = 2 because prime(11) = 31 = 2*1 + 4 + 25 = 4 + 3*9.
MATHEMATICA
Table[Count[PowersRepresentations[Prime[n], 4, 2], _?(Min[#] > 0 &)], {n, 84}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Arkadiusz Wesolowski, Nov 02 2012
STATUS
approved