OFFSET
1,1
LINKS
Bela Bajnok, Additive Combinatorics: A Menu of Research Problems, arXiv:1705.07444 [math.NT], May 2017. See Table in Section 1.6.3.
MATHEMATICA
u[n_, m_, h_] := (d = Divisors[n]; Min[(h*Ceiling[m/d] - h + 1)*d]); Table[u[n, 4, 2], {n, 1, 70}]
Table[With[{c=Divisors[n]}, Min[(2*Ceiling[4/c]-1)*c]], {n, 100}] (* Harvey P. Dale, Feb 10 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert Price, Aug 23 2017
STATUS
approved