OFFSET
1,2
COMMENTS
a(n) is the least common multiple (or LCM) of {1, 4, 9, 16, ..., n^2}.
LINKS
T. D. Noe, Table of n, a(n) for n = 1..200
Jon T. Butler, Tsutomu Sasao, Realizing all Index Generation Functions by the Row-Shift Method, IEEE 49th International Symposium on Multiple-Valued Logic (ISMVL 2019).
FORMULA
a(n) = A003418(n)^2.
EXAMPLE
a(5) = lcm {1, 4, 9, 16, 25} = 3600.
MATHEMATICA
Table[LCM@@Range[n], {n, 20}]^2 (* Harvey P. Dale, Mar 28 2011 *)
PROG
(Python) # generator of sequence
from math import lcm
from itertools import accumulate, count, islice
def sqr(x): return x*x
def agen(): yield from map(sqr, accumulate(count(1), lcm))
print(list(islice(agen(), 22))) # Michael S. Branicky, Oct 04 2022
CROSSREFS
KEYWORD
easy,nice,nonn
AUTHOR
STATUS
approved