login
A124509
Range of A124508.
4
1, 6, 12, 24, 36, 48, 72, 96, 144, 192, 216, 288, 384, 432, 576, 768, 864, 1152, 1296, 1536, 1728, 2304, 2592, 3072, 3456, 4608, 5184, 6144, 6912, 7776, 9216, 10368, 12288, 13824, 15552, 18432, 20736, 24576, 27648, 31104, 36864, 41472, 46656, 49152, 55296, 62208
OFFSET
1,2
COMMENTS
1 together with numbers of the form 2^i * 3^j with i >= j >= 1. - Amiram Eldar, Jul 11 2023
LINKS
Eric Weisstein's World of Mathematics, Smooth Number.
FORMULA
a(n) = A124508(A124510(n)).
Sum_{n>=1} 1/a(n) = 7/5. - Amiram Eldar, Jul 11 2023
MATHEMATICA
With[{max = 70000}, Join[{1}, Sort[Flatten[Table[2^i*3^j, {i, 1, Log2[max]}, {j, 1, Min[i, Log[3, max/2^i]]}]]]]] (* Amiram Eldar, Jul 11 2023 *)
CROSSREFS
Subsequence of A003586.
A007283 is a subsequence.
Sequence in context: A140522 A065218 A187678 * A319127 A367099 A063104
KEYWORD
nonn,easy
AUTHOR
Reinhard Zumkeller, Nov 04 2006
EXTENSIONS
Missing term a(43) inserted and more terms added by Amiram Eldar, Jul 11 2023
STATUS
approved