This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A061214 Product of composite numbers between the n-th and (n+1)st primes. 12
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A006530(a(n)) = A052248(n) for n > 1. - Reinhard Zumkeller, Jun 22 2011 LINKS T. D. Noe, Table of n, a(n) for n = 1..2000 EXAMPLE 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. MAPLE A061214 := proc(n)     local k ;     product(k, k=ithprime(n)+1..ithprime(n+1)-1) ; end proc: # R. J. Mathar, Apr 23 2013 MATHEMATICA Table[Times@@Range[Prime[n]+1, Prime[n+1]-1], {n, 30}] (* Harvey P. Dale, Jun 14 2011 *) PROG (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' -- Reinhard Zumkeller, Jun 22 2011 CROSSREFS Cf. A052297 Sequence in context: A027717 A035481 A323214 * A137024 A054264 A077305 Adjacent sequences:  A061211 A061212 A061213 * A061215 A061216 A061217 KEYWORD nonn AUTHOR Amarnath Murthy, Apr 21 2001 EXTENSIONS More terms from James A. Sellers, Apr 24 2001 Better definition from T. D. Noe, Jan 21 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 21 13:37 EDT 2019. Contains 327253 sequences. (Running on oeis4.)