OFFSET
1,1
COMMENTS
a(1) is the least common multiple of every ab+ac+bc, where a,b,c=1,2,3,4,6,8.
REFERENCES
Zoltan Kovacs, Abacus 2001.5 (Hungarian periodical)
FORMULA
a(n)=n*a(1) for n=1, 2, 3, 4 a(5)=6*a(1), a(6)=8*a(1)
EXAMPLE
a(1)*a(2)*a(3) = a(1)*2a(1)*3a(1)/(a(1)*2a(1) + a(1)*3a(1) + 2a(1)*3a(1)) = 6a(1)/11 is an integer because 11 | a(1).
CROSSREFS
KEYWORD
fini,full,nonn
AUTHOR
Miklos Kristof, Nov 05 2002
STATUS
approved