A082536 a(1) = 1; for n > 1, a(n) = smallest number greater than a(n-1) such that a(n-1)*a(n)+1 is a cube.

1, 7, 9, 38, 1561, 3926, 4958, 5284, 9316636, 84705277923, 774752630747122741, 8816203161790126559791912099597266, 333977591776082560884277873242324869870383615439405188

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Example

7*9 + 1 = 64 = 8^3, 9*38 + 1 = 343 = 7^3.

Crossrefs

Cf. A082537, A083203.

Sequence in context: A359367 A321760 A083203 * A057590 A140787 A032695

Adjacent sequences: A082533 A082534 A082535 * A082537 A082538 A082539

Keyword

nonn

Author

Amarnath Murthy, Apr 28 2003

Extensions

Corrected and extended by Vladeta Jovovic, May 01 2003

More terms from Michel ten Voorde Jun 23 2003

More terms from Vladeta Jovovic, Jun 29 2003

a(11)-a(13) from David Wasserman, Mar 26 2004

Status

approved