OFFSET
1,1
COMMENTS
n must be an odd power of a number congruent to 3 modulo 4. - Charlie Neder, Feb 11 2019
LINKS
Charlie Neder, Table of n, a(n) for n = 1..841
EXAMPLE
a(1)=7^3, a(2)=11^3, a(3)=23^3, a(4)=31^3, a(5)=35^3, a(6)=43^3, a(7)=47^3, a(8)=67^3, a(9)=71^3, a(10)=95^3, a(11)=115^3, a(12)=131^3, a(13)=143^3, a(14)=23^5 and a(15)=211^3; most are cubes.
MATHEMATICA
pp = Join[{1}, Select[ Range[10^7], Apply[GCD, Last[ Transpose[ FactorInteger[ # ]]]] > 1 & ]]; Select[pp, PrimeQ[(# - 9)/2] & ]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Oct 11 2002
EXTENSIONS
Extended by Robert G. Wilson v, Oct 14 2002
a(16)=a(29) from Charlie Neder, Feb 11 2019
STATUS
approved