OFFSET
1,1
COMMENTS
Squarefree factors of k^2+2k-3. - Artur Jasinski, May 19 2008
FORMULA
Least positive integer of the form m(m+4)/(w^2), where m and w are positive integers.
PROG
(PARI) a(n)=if(n<1, 0, core(n^2+4*n))
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Michael Somos, Oct 28, 2002
STATUS
approved