OFFSET
1,2
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..10000
EXAMPLE
5^2 + 1 = 26 has divisors 1,2,13,26, so that k=4 and d(k+1-i) - d(i) ranges through {-25,-11,11,25}, so that a(5) = 11.
MATHEMATICA
f[n_] := f[n] = n^2+1; Table[Divisors[f[n]] - Reverse[Divisors[f[n]]], {n, 1, 10}]
Table[Min[Abs[Divisors[f[n]] - Reverse[Divisors[f[n]]]]], {n, 1, 100}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Apr 11 2017
STATUS
approved