A056009 a(n) = (n^n + 1)/ (n^(2^a) + 1), where 2^a is the highest power of 2 dividing n.

1, 1, 7, 1, 521, 1261, 102943, 1, 38742049, 99009901, 23775972551, 429960961, 21633936185161, 56406126018061, 27368368148803711, 1, 45957792327018709121, 121065871000912423309, 98920982783015679456199

Offset

1,3

Links

Michael De Vlieger, Table of n, a(n) for n = 1..388

Example

The sixth term is (6^6 + 1)/ (6^(2^1) + 1) = 1261, since 2^1 is highest power of 2 dividing 6.

Mathematica

Array[(#^# + 1)/(#^(2^IntegerExponent[#, 2]) + 1) &, 19] (* Michael De Vlieger, Dec 11 2017 *)

Crossrefs

Sequence in context: A009792 A103243 A027496 * A376458 A159252 A357389

Adjacent sequences: A056006 A056007 A056008 * A056010 A056011 A056012

Keyword

easy,nonn

Author

Leroy Quet, Jul 24 2000

Status

approved