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

1,1

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.

Mathematica

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

Prog

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

Crossrefs

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

Sequence in context: A261425 A297476 A235871 * A098028 A100301 A084167

Adjacent sequences: A240800 A240801 A240802 * A240804 A240805 A240806

Keyword

nonn

Author

N. J. A. Sloane, Apr 14 2014

Status

approved