A185078 -id:A185078 - cp's OEIS frontend

A185079 a(n) = A064380(n) * A049417(n).

3, 8, 15, 24, 36, 48, 60, 80, 90, 120, 140, 168, 192, 216, 255, 288, 330, 360, 390, 448, 504, 528, 600, 624, 672, 720, 760, 840, 936, 960, 1020, 1056, 1134, 1200, 1300, 1368, 1440, 1512, 1620, 1680, 1632, 1848, 1920, 1980, 2088, 2208, 2312, 2400, 2496, 2592, 2730, 2808, 2880, 3024, 3240, 3200, 3330

Offset: 2

Vladimir Shevelev, Feb 18 2011

nonn

Amiram Eldar, Table of n, a(n) for n = 2..10000

Cf. A064380, A049417, A007357, A185078, A185373, A185383.

a(n) = n^2 + o(n^(1+eps)).

Corrected and extended by T. D. Noe, Feb 18 2011

A185088 a(n) = |n^2 - A185079(n)|.

Original entry on oeis.org

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

Vladimir Shevelev, Feb 18 2011

nonn

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.

Amiram Eldar, Table of n, a(n) for n = 2..10000

Cf. A185079, A050376, A064380, A049417, A007357, A185078, A185373, A185383.

a(A050376(n)) = 1.

cp's OEIS Frontend

A185079 a(n) = A064380(n) * A049417(n).

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