OFFSET
1,2
COMMENTS
EXAMPLE
Some valid sequences for n = 2, 4, 6, 12, 15, and 24 are
a(2) = 4 via lcm(2, 4) = 2^2,
a(4) = 4 via lcm(4) = 2^2,
a(6) = 12 via lcm(6, 9, 12) = 12^2,
a(12) = 18 via lcm(12, 18) = 6^2,
a(15) = 25 via lcm(15, 16, 18, 25) = 60^2, and
a(24) = 48 via lcm(24, 36, 48) = 12^2.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Peter Kagey, Mar 07 2018
STATUS
approved