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

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

Offset: 1

Author

Emre APARI, Feb 23 2016

Keywords

• nonn
• easy

Examples

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

Crossrefs

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

Programs

Magma

[7^p: p in PrimesUpTo(45)]; // Vincenzo Librandi, Feb 25 2016

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 *)

PARI

a(n) = 7^prime(n); \\ Altug Alkan, Mar 04 2016

Formula

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

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