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A185088
a(n) = |n^2 - A185079(n)|.
2
1, 1, 1, 1, 0, 1, 4, 1, 10, 1, 4, 1, 4, 9, 1, 1, 6, 1, 10, 7, 20, 1, 24, 1, 4, 9, 24, 1, 36, 1, 4, 33, 22, 25, 4, 1, 4, 9, 20, 1, 132, 1, 16, 45, 28, 1, 8, 1, 4, 9, 26, 1, 36, 1, 104, 49, 34, 1, 0, 1, 4, 49, 16, 25, 36, 1, 34, 57, 140, 1, 84, 1, 4, 9, 76, 73, 36, 1, 26, 1, 80, 1, 16, 11, 128, 9, 4, 1, 180, 105, 64, 55, 92, 25, 36
OFFSET
2,7
COMMENTS
Zeros a(z)=0 occur at z=6, 60, 120, 360, 816,... For these z, A049417(z) | z^2, but there may be other numbers like 90, 180, 540,... satisfying this divisibility criterion which are not places of zeros (the criterion is necessary, not sufficient), see A185288.
LINKS
FORMULA
a(A050376(n)) = 1.
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Feb 18 2011
STATUS
approved