OFFSET
1,1
COMMENTS
Semiprime analog of A066649, Primes of the form a^2 + b^3 with a, b > 0.
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..10000
EXAMPLE
a(1) = 9 = 2^3 + 1^2 = 3*3.
a(2) = 10 = 3^2 + 1^3 = 2*5.
a(3) = 26 = 5^2 + 1^3 = 2*13.
a(4) = 33 = 5^2 + 2^3 = 3*11.
a(5) = 57 = 7^2 + 2^3 = 3*19.
a(6) = 65 = 1^2 + 4^3 = 8^2 + 1^3 = 5*13.
MATHEMATICA
Select[ Union[ Plus @@@ Tuples[{Range[4^3]^2, Range[4^2]^3}]], # < 1082 && Plus @@ Last /@ FactorInteger[#] == 2 &] (* Giovanni Resta, Jun 12 2016 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Sep 25 2006
EXTENSIONS
More terms from Robert G. Wilson v, Sep 29 2006
STATUS
approved