OFFSET
1,2
COMMENTS
Number n such that (d*k+1) /= (n/d), for k>0 and each value of d, where d is a divisor >1 of n.
MATHEMATICA
n = 71; Take[Complement[Range[n^2], DeleteDuplicates@ Sort@ Flatten@ Table[x + y x^2, {x, 2, n}, {y, 1, n}]], n] (* Michael De Vlieger, Apr 17 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Gionata Neri, Apr 16 2015
STATUS
approved