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A162694
Strictly positive numbers n such that 36*n/(36+n) are integers.
12
12, 18, 36, 45, 72, 108, 126, 180, 288, 396, 612, 1260
OFFSET
1,1
COMMENTS
The 36th row of A127730.
The ansatz 36*n/(36+n) = j (any integer j) yields n = 36*j/(36-j) which demonstrates that the sequence is finite if n >= 0. - R. J. Mathar, Jul 13 2009
Positive integers n such that half of the harmonic mean of 36 and n is an integer. - Wesley Ivan Hurt, Sep 07 2014
MATHEMATICA
Select[Range[1000], IntegerQ[36#/(36 + #)] &] (* Alonso del Arte, Sep 06 2014 *)
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
EXTENSIONS
Edited by R. J. Mathar, Jul 13 2009
STATUS
approved