A118456 - OEIS

A118456

a(n) = Product_{k=1..n} P(k), where P(k) is the smallest prime >= k.

2, 4, 12, 60, 300, 2100, 14700, 161700, 1778700, 19565700, 215222700, 2797895100, 36372636300, 618334817100, 10511691890700, 178698762141900, 3037878956412300, 57719700171833700, 1096674303264840300, 25223508975091326900, 580140706427100518700, 13343236247823311930100

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..448

EXAMPLE

a(5)=300 because the smallest primes that are not smaller than 1,2,3,4 and 5 are 2,2,3,5 and 5, respectively, having product 2*2*3*5*5=300.

MAPLE

a:=n->product(nextprime(k-1), k=1..n): seq(a(n), n=1..22); # Emeric Deutsch, Apr 29 2006

MATHEMATICA

FoldList[Times, Table[NextPrime[k - 1], {k, 22}]] (* Michael De Vlieger, Aug 21 2017 *)

PROG