A299644 a(n) = prime(prime(n+1)) + prime(prime(n)).

8, 16, 28, 48, 72, 100, 126, 150, 192, 236, 284, 336, 370, 402, 452, 518, 560, 614, 684, 720, 768, 832, 892, 970, 1056, 1110, 1150, 1186, 1216, 1326, 1448, 1512, 1570, 1656, 1736, 1796, 1886, 1958, 2022, 2094, 2150, 2240, 2324, 2372, 2418, 2514, 2706, 2842, 2880, 2918

Offset: 1

Author

Vincenzo Librandi, Mar 20 2018

Keywords

• nonn

Comments

All terms are even. - Michel Marcus, Mar 20 2018

Crossrefs

Cf. A000040, A006450, A073131.

Programs

Magma

[NthPrime(NthPrime(n+1))+NthPrime(NthPrime(n)):n in [1..50]];

Mathematica

Table[Prime[Prime[n + 1]] + Prime[Prime[n]], {n, 1, 50}]

PARI

a(n) = prime(prime(n+1)) + prime(prime(n)); \\ Michel Marcus, Mar 20 2018

Formula

a(n) = A006450(n+1) + A006450(n).