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A162688
Strictly positive numbers n such that 12*n/(12+n) are integers.
19
4, 6, 12, 24, 36, 60, 132
OFFSET
1,1
COMMENTS
The 12 row of A127730.
The ansatz 12*n/(12+n)=j (any integer j) yields n=12*j/(12-j) which demonstrates that the sequence is finite if n>=0. [R. J. Mathar, Jul 13 2009]
MATHEMATICA
f[a_, b_]:=(a*b)/(a+b); a=12; lst={}; Do[If[f[a, n]==IntegerPart[f[a, n]], AppendTo[lst, n]], {n, 9!}]; lst
CROSSREFS
Cf. A127730. [From Franklin T. Adams-Watters, Aug 07 2009]
Sequence in context: A120211 A308471 A357809 * A362883 A352634 A070232
KEYWORD
nonn,fini,full
AUTHOR
EXTENSIONS
Edited by R. J. Mathar, Jul 13 2009
STATUS
approved