1,16

Altug Alkan, Table of n, a(n) for n = 1..10000

a(16) = 2 because 16 = 4 + 12 and 16 = 8 + 8 are only corresponding solutions.

(PARI) a(n) = sum(k=1, n\2, !issquarefree(k) && !issquarefree(n-k));

Cf. A013929, A071068.

Sequence in context: A219052 A060826 A078134 * A083661 A029369 A255315

Adjacent sequences: A282377 A282378 A282379 * A282381 A282382 A282383

nonn

Altug Alkan, Feb 13 2017

approved