A269327 a(n) = 7^prime(n).

49, 343, 16807, 823543, 1977326743, 96889010407, 232630513987207, 11398895185373143, 27368747340080916343, 3219905755813179726837607, 157775382034845806615042743, 18562115921017574302453163671207, 44567640326363195900190045974568007

Offset

1,1

Links

Table of n, a(n) for n=1..13.

Formula

a(n) = 7^A000040(n).

Sum_{n>=1} 1/a(n) = A132822. - Amiram Eldar, Aug 11 2020

Example

The second prime is 3, hence a(2) = 7^3 = 343.
The third prime is 5, hence a(3) = 7^5 = 16807.

Maple

A269327:=n->7^ithprime(n): seq(A269327(n), n=1..20); # Wesley Ivan Hurt, Mar 07 2016

Mathematica

7^Prime[Range[20]] (* Alonso del Arte, Feb 23 2016 *)

Prog

(Magma) [7^p: p in PrimesUpTo(45)]; // Vincenzo Librandi, Feb 25 2016
(PARI) a(n) = 7^prime(n); \\ Altug Alkan, Mar 04 2016

Crossrefs

Cf. A000040, A000420, A034785, A053810, A057901, A057902, A132822.

Sequence in context: A211756 A036323 A066429 * A206255 A017606 A206248

Adjacent sequences: A269324 A269325 A269326 * A269328 A269329 A269330

Keyword

nonn,easy

Author

Emre APARI, Feb 23 2016

Status

approved