A085272 a(n) = lcm_{k=1..n} (prime(k) + 1).

3, 12, 12, 24, 24, 168, 504, 2520, 2520, 2520, 10080, 191520, 191520, 2106720, 2106720, 6320160, 6320160, 195924960, 3330724320, 3330724320, 123236799840, 123236799840, 123236799840, 123236799840, 862657598880, 862657598880

Offset: 1

Author

Reinhard Zumkeller, Aug 12 2003

Keywords

• nonn
• easy

Examples

			a(6) = lcm(2+1, 3+1, 5+1, 7+1, 11+1, 13+1) = lcm(3, 2^2, 2*3, 2^3, 3*2^2, 2*7) = 7*3*2^3 = 168.
		

Links

• Hugo Pfoertner, Table of n, a(n) for n = 1..1480

Crossrefs

Cf. A008864, A003418, A002110, A058254.

Programs

PARI

a(n) = lcm(vector(n, k, prime(k)+1)); \\ Michel Marcus, Mar 15 2018