A172165 A simple sequence a(n) = n + n^(n-1).

2, 4, 12, 68, 630, 7782, 117656, 2097160, 43046730, 1000000010, 25937424612, 743008370700, 23298085122494, 793714773254158, 29192926025390640, 1152921504606846992, 48661191875666868498, 2185911559738696531986, 104127350297911241532860

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..150

Formula

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

a(n) = n + A000169(n). - R. J. Mathar, Jan 30 2010

Example

a(10) = 1000000010 = 10 + 10^9.

Mathematica

Table[n + n^(n - 1), {n, 25}] (* Vladimir Joseph Stephan Orlovsky, Jun 16 2011 *)

Prog

(Magma) [n + n^(n-1): n in [1..20]]; // Vincenzo Librandi, Jun 17 2011

Crossrefs

Sequence in context: A129824 A266463 A013207 * A078919 A085864 A060935

Adjacent sequences: A172162 A172163 A172164 * A172166 A172167 A172168

Keyword

easy,nonn

Author

Lorenzo Cococcia, Jan 27 2010

Extensions

Every second term removed by R. J. Mathar, Jan 30 2010

Status

approved