A352025 a(n) = floor(sqrt(6*prime(n))).

3, 4, 5, 6, 8, 8, 10, 10, 11, 13, 13, 14, 15, 16, 16, 17, 18, 19, 20, 20, 20, 21, 22, 23, 24, 24, 24, 25, 25, 26, 27, 28, 28, 28, 29, 30, 30, 31, 31, 32, 32, 32, 33, 34, 34, 34, 35, 36, 36, 37, 37, 37, 38, 38, 39, 39, 40, 40, 40, 41, 41, 41, 42, 43, 43, 43, 44

Offset: 1

Author

Zak Seidov, Feb 28 2022

Keywords

• nonn

Crossrefs

Cf. A000006, A000196, A138636.

Programs

Mathematica

Table[Floor[Sqrt[6*Prime[k]]], {k, 50}]

PARI

a(n) = sqrtint(6*prime(n)); \\ Michel Marcus, Mar 19 2022

Formula

a(n) = A000196(A138636(n)). - Michel Marcus, Mar 19 2022