OFFSET
0,3
COMMENTS
Similar comments about the trailing digits apply here as in A173185.
a(n) gives the position of the last element of row n in irregular tables like A238280.
From a(2)=3 onward all terms are divisible by three.
a(n) is divisible by 73 for n >= 72. Therefore a(n)/3 is prime for only 13 values of n: 3, 4, 6, 8, 9, 12, 16, 22, 23, 31, 35, 48 and 53. - Amiram Eldar, Sep 19 2022
LINKS
Antti Karttunen, Table of n, a(n) for n = 0..250
FORMULA
a(n) = A173185(n)-1.
MATHEMATICA
Prepend[Accumulate @ Table[LCM @@ Range[n], {n, 1, 30}], 0] (* Amiram Eldar, Sep 19 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Feb 27 2014
STATUS
approved