A057901 a(n) = 3^prime(n).

9, 27, 243, 2187, 177147, 1594323, 129140163, 1162261467, 94143178827, 68630377364883, 617673396283947, 450283905890997363, 36472996377170786403, 328256967394537077627, 26588814358957503287787

Offset: 1

Author

Henry Bottomley, Sep 29 2000

Keywords

• nonn

Examples

			a(4) = 3^7 = 2187.
		

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..100

Crossrefs

Cf. A034785, A053810, A057902, A132800.

Subsequence of A000244 (powers of 3).

Programs

Magma

[3^p: p in PrimesUpTo(30)]; // Vincenzo Librandi, Jun 03 2014

Mathematica

3^Prime@Range@30 (* Vladimir Joseph Stephan Orlovsky, Apr 11 2011 *)

Formula

a(n) = 3^A000040(n).

Sum_{n>=1} 1/a(n) = A132800. - Amiram Eldar, Aug 11 2020