A239885 a(n) = 2^(n-2) * prime(n).

1, 3, 10, 28, 88, 208, 544, 1216, 2944, 7424, 15872, 37888, 83968, 176128, 385024, 868352, 1933312, 3997696, 8781824, 18612224, 38273024, 82837504, 174063616, 373293056, 813694976, 1694498816, 3456106496, 7180648448, 14629732352, 30333206528

Offset: 1

Author

Gerasimov Sergey, Mar 29 2014

Keywords

• nonn
• easy

Links

• G. C. Greubel, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A000040, A000079, A110295.

Programs

Magma

[2^(n-2)*NthPrime(n): n in [1..50]]; // G. C. Greubel, Jan 04 2023

Mathematica

Table[Prime[n]2^(n-2),{n,30}] (* Harvey P. Dale, Aug 19 2019 *)

PARI

vector(50, n, prime(n)*2^(n-2)) \\ Colin Barker, Mar 29 2014

SageMath

[2^(n-2)*nth_prime(n) for n in range(1,51)] # G. C. Greubel, Jan 04 2023

Formula

a(n) = A110295(n)/2.