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
Keywords
Links
- Amiram Eldar, Table of n, a(n) for n = 0..78
Programs
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Mathematica
a[n_] := Prime[2^n] + 1; Array[a, 33, 0] (* Amiram Eldar, Jul 11 2025 *)
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PARI
a(n) = prime(2^n) + 1; \\ Amiram Eldar, Jul 11 2025
Formula
a(n) = A033844(n) + 1.
a(n) = A018249(n) + 2. - Amiram Eldar, Jul 11 2025
Extensions
More terms from Amiram Eldar, Jul 11 2025