OFFSET
0,1
COMMENTS
These numbers are of the form 3^k*2^0 + 3^{k-1}*2^{a_1} + ... + 3^1*2^{a_{k-1}} + 3^0*2^{a_k} in which every power 3^i appears, 0 <= i <= k, and where a_i satisfies a_0 = 0, a_0 < a_1 < ... < a_k.
REFERENCES
Kenneth Vollmar, Recursive calculation of 3-smooth representations special of level k, To be submitted mid-2013.
LINKS
R. Blecksmith, M. McCallum and J. L. Selfridge, 3-smooth representations of integers, Amer. Math. Monthly, 105 (1998), 529-543.
CROSSREFS
KEYWORD
nonn
AUTHOR
Kenneth Vollmar, Jun 05 2013
STATUS
approved