

A066786


a(n) = least natural number k such that the distance between (n, phi(n)) and (n+k, phi(n+k)) is an integer (i.e., k^2 + (phi(n+k)  phi(n))^2 is a square), if such k exists; = 0 otherwise.


0



1, 12, 1, 2, 3, 3, 2, 2, 5, 2, 3, 3, 3, 4, 1, 4, 15, 8, 8, 4, 3, 48, 23, 6, 5, 2, 8, 8, 5, 24, 8, 2, 11, 6, 4, 6, 20, 16, 6, 8, 7, 32, 6, 6, 6, 33, 8, 7, 8, 16
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