A051440 a(n) = prime(2^n) + 1.

3, 4, 8, 20, 54, 132, 312, 720, 1620, 3672, 8162, 17864, 38874, 84018, 180504, 386094, 821642, 1742538, 3681132, 7754078, 16290048, 34136030, 71378570, 148948140, 310248242, 645155198, 1339484198, 2777105130, 5750079048, 11891268402, 24563311310, 50685770168, 104484802058

Offset

0,1

Links

Amiram Eldar, Table of n, a(n) for n = 0..78

Formula

a(n) = A033844(n) + 1.

a(n) = A018249(n) + 2. - Amiram Eldar, Jul 11 2025

Mathematica

a[n_] := Prime[2^n] + 1; Array[a, 33, 0] (* Amiram Eldar, Jul 11 2025 *)

Prog

(PARI) a(n) = prime(2^n) + 1; \\ Amiram Eldar, Jul 11 2025

Crossrefs

Cf. A000040, A018249, A033844, A051438, A051439.

Sequence in context: A065034 A332707 A129285 * A101932 A204521 A073313

Adjacent sequences: A051437 A051438 A051439 * A051441 A051442 A051443

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Amiram Eldar, Jul 11 2025

Status

approved