OFFSET
1,1
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
EXAMPLE
a(1)=9 because 2^3+1^3=3*3, a(2)=26=3^3-1^3=2*13.
a(5)=91 is the smallest semiprime expressible in two different ways: 91=4^3+3^3=6^3-5^3=7*13.
PROG
(PARI) T=thueinit('z^3+1);
is(n)=bigomega(n)==2 && #thue(T, n)
list(lim)=my(v=List()); forprime(p=2, lim\2, forprime(q=2, min(lim\p, p), if(#thue(T, p*q), listput(v, p*q)))); Set(v) \\ Charles R Greathouse IV, Nov 29 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Jun 25 2003
STATUS
approved