A072671 Least m which can be written as i*j+i+j in n different ways: A072670(m)=n.

0, 3, 11, 23, 35, 59, 191, 119, 179, 239, 575, 359, 1295, 899, 719, 839, 9215, 1259, 786431, 1679, 2879, 15359, 3599, 2519, 6479, 61439, 6299, 6719, 2359295, 5039, 3221225471, 7559, 46079, 983039, 25919, 10079, 206158430207, 32399, 184319, 15119, 44099, 20159, 5308415, 107519, 25199, 2985983, 9663676415, 27719, 233279, 45359

Offset: 0

Author

Reinhard Zumkeller, Jun 30 2002

Keywords

• nonn

Comments

a(n) = A038549(n+1) - 1.

Crossrefs

Cf. A038549, A072670.