A078142 a(n) = the sum of the differences of the distinct prime factors p of n and the next square larger than p.

0, 2, 1, 2, 4, 3, 2, 2, 1, 6, 5, 3, 3, 4, 5, 2, 8, 3, 6, 6, 3, 7, 2, 3, 4, 5, 1, 4, 7, 7, 5, 2, 6, 10, 6, 3, 12, 8, 4, 6, 8, 5, 6, 7, 5, 4, 2, 3, 2, 6, 9, 5, 11, 3, 9, 4, 7, 9, 5, 7, 3, 7, 3, 2, 7, 8, 14, 10, 3, 8, 10, 3, 8, 14, 5, 8, 7, 6, 2, 6, 1, 10, 17, 5, 12, 8, 8, 7, 11, 7, 5, 4, 6, 4, 10, 3, 3, 4