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A061214
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Product of composite numbers between the n-th and (n+1)st primes.
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19
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1, 4, 6, 720, 12, 3360, 18, 9240, 11793600, 30, 45239040, 59280, 42, 91080, 311875200, 549853920, 60, 1072431360, 328440, 72, 2533330800, 531360, 4701090240, 60072730099200, 970200, 102, 1157520, 108, 1367520, 1063186156509747740870400000, 2146560, 43191973440
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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a(4) = 8 * 9 * 10 = 720. 7 is the fourth prime and 11 is the fifth prime. a(5) = 12 as 11 and 13 both are primes.
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MAPLE
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local k ;
product(k, k=ithprime(n)+1..ithprime(n+1)-1) ;
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MATHEMATICA
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Table[Times@@Range[Prime[n]+1, Prime[n+1]-1], {n, 30}] (* Harvey P. Dale, Jun 14 2011 *)
Times@@Range[#[[1]]+1, #[[2]]-1]&/@Partition[Prime[Range[40]], 2, 1] (* Harvey P. Dale, Apr 23 2022 *)
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PROG
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(PARI) { n=0; q=2; forprime (p=3, prime(2001), a=1; for (i=q + 1, p - 1, a*=i); q=p; write("b061214.txt", n++, " ", a) ) } \\ Harry J. Smith, Jul 19 2009
(PARI) v=primes(100); for(i=1, #v-1, v[i]=prod(j=v[i]+1, v[i+1]-1, j)); vecextract(v, "1..-2") \\ Charles R Greathouse IV, Feb 27 2012
(Haskell)
a061214 n = a061214_list !! (n-1)
a061214_list = f a000040_list where
f (p:ps'@(p':ps)) = (product [p+1..p'-1]) : f ps'
(Python)
from math import prod
from sympy import prime
def A061214(n): return prod(i for i in range(prime(n)+1, prime(n+1))) # Chai Wah Wu, Jul 10 2022
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Better definition from T. D. Noe, Jan 21 2008
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STATUS
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approved
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