OFFSET
1,2
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
a(1) = 1, a(2) = 3 and a(3) = 7 because the first 7 numbers of the form 3^i * 7^j with i >= 0 and j >= 1 are 7, 21, 49, 63, 147, 189 and 343. - Robert Israel, Aug 20 2024
MAPLE
dA:= map(t -> 1+ilog[3](7^t), [$0..100]):
ListTools:-PartialSums(dA); # Robert Israel, Aug 20 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Name clarified by Robert Israel, Aug 20 2024
STATUS
approved