A065895 Which composite number is n^n ?

0, 1, 17, 201, 2679, 41834, 757857, 15699344, 366719682, 9544947488, 274049557236, 8606313278052

Offset

1,3

Links

Table of n, a(n) for n=1..12.

Example

27 is the 17th composite number: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27.

Mathematica

Table[ n^n - (PrimePi[n^n]) - 1, {n, 1, 12} ]

Crossrefs

Cf. A002808, A000720, A000312.

Sequence in context: A201258 A166216 A021134 * A009479 A279448 A017897

Adjacent sequences: A065892 A065893 A065894 * A065896 A065897 A065898

Keyword

nonn

Author

Labos Elemer, Nov 28 2001

Extensions

More terms from Robert G. Wilson v and Vladeta Jovovic, Nov 29 2001

Status

approved