A127598 Least primes of the form k 4^n + (4^n-1)/3.

2, 5, 5, 149, 853, 2389, 17749, 70997, 218453, 2708821, 3495253, 13981013, 39146837, 492131669, 626349397, 27201459541, 27201459541, 297784399189, 297784399189, 3665038759253, 3665038759253, 89426945725781

Offset

1,1

Links

Table of n, a(n) for n=1..22.

Mathematica

a = {}; Do[k = 0; While[ !PrimeQ[k 4^n + (4^n - 1)/3], k++ ]; AppendTo[a, k 4^n + (4^n - 1)/3], {n, 0, 50}]; a (*Artur Jasinski*)

Crossrefs

Cf. A035050, A007522, A127575, A127576, A127577, A127578, A127580, A127581, A087522, A127586, A127587, A127589, A127590, A127591, A127592, A127593, A127594, A127597.

Sequence in context: A180092 A074636 A368388 * A196550 A011037 A111987

Adjacent sequences: A127595 A127596 A127597 * A127599 A127600 A127601

Keyword

nonn

Author

Artur Jasinski, Jan 19 2007

Status

approved