A271511 a(n) = (p+1)*(p+2)/2 where p is the n-th prime.

6, 10, 21, 36, 78, 105, 171, 210, 300, 465, 528, 741, 903, 990, 1176, 1485, 1830, 1953, 2346, 2628, 2775, 3240, 3570, 4095, 4851, 5253, 5460, 5886, 6105, 6555, 8256, 8778, 9591, 9870, 11325, 11628, 12561, 13530, 14196, 15225, 16290, 16653, 18528, 18915, 19701

Offset: 1

Author

Vincenzo Librandi, Apr 09 2016

Keywords

• nonn
• easy

Comments

Subsequence of A253145.

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A253145.

Programs

Magma

[(p+1)*(p+2) / 2: p in PrimesUpTo(200)];

Mathematica

Table[(Prime[n]^2 + 3 Prime[n] + 2) / 2, {n, 50}]

PARI

lista(nn) = forprime(p=2, nn, print1((p+1)*(p+2)/2, ", ")); \\ Altug Alkan, Apr 09 2016