A240803 a(n) = 2 + product of first n odd primes.

5, 17, 107, 1157, 15017, 255257, 4849847, 111546437, 3234846617, 100280245067, 3710369067407, 152125131763607, 6541380665835017, 307444891294245707, 16294579238595022367, 961380175077106319537, 58644190679703485491637, 3929160775540133527939547, 278970415063349480483707697

Offset: 1

Author

N. J. A. Sloane, Apr 14 2014

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..200
• Des MacHale, Infinitely many proofs that there are infinitely many primes, Math. Gazette, 97 (No. 540, 2013), 495-498.

Crossrefs

Cf. A000945, A000946, A005265, A005266, A240804.

Programs

Magma

[2+&*[NthPrime(i+1): i in [1..n]]: n in [1..20]]; // Vincenzo Librandi, Apr 15 2014

Mathematica

Table[Product[Prime[k + 1], {k, 1, n}] + 2, {n, 1, 30}] (* Vincenzo Librandi, Apr 15 2014 *)