A273788 Least number k such that k^2 + k^3 is of the form x^2 + y^3 in exactly n ways where x, y > 0.

1, 6, 24, 40, 180, 440, 3640, 18480, 137280, 1320, 703560, 15960, 1256640, 1436160, 96360

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Example

a(2) = 6 because 6^2 + 6^3 = 15^2 + 3^3.

Crossrefs

Cf. A011379, A060835, A122054.

Sequence in context: A225363 A230328 A082195 * A063961 A328180 A218291

Adjacent sequences: A273785 A273786 A273787 * A273789 A273790 A273791

Keyword

nonn,more

Author

Altug Alkan, May 30 2016

Extensions

a(7)-a(15) from Giovanni Resta, Jun 03 2016

Status

approved