A085699 Smallest multiple of n such that a(n) + a(n-1) is an n-th power.

1, 8, 117, 508, 32260, 229884, 19257287

Offset

1,2

Comments

a(8) does not exist because no 8th power is congruent to a(7)=19257287 (mod 8).

Links

Table of n, a(n) for n=1..7.

Example

1, 1+8, 8+117, 117+508 give 1,9,125,625... which are 1,3^2,5^3,5^4,...

Crossrefs

Sequence in context: A231553 A291077 A056988 * A046914 A364984 A341197

Adjacent sequences: A085696 A085697 A085698 * A085700 A085701 A085702

Keyword

fini,full,nonn

Author

Amarnath Murthy, Jason Earls, Jul 18 2003

Extensions

Edited by Dean Hickerson, Jul 20 2003

Status

approved