The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A087105 (prime(n-1) + 1)*(prime(n+1) - 1). 2
 12, 24, 60, 96, 192, 252, 396, 560, 720, 1080, 1280, 1596, 1932, 2288, 2784, 3240, 3960, 4340, 4896, 5616, 6068, 7040, 8064, 9000, 9996, 10812, 11232, 12096, 13860, 14820, 17408, 18216, 20424, 21000, 23400, 24624, 26228, 28208, 29904, 31320 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS a(n) = A006093(n+1)*A008864(n-1). LINKS Robert Israel, Table of n, a(n) for n = 2..10000 EXAMPLE a(10)=(prime(9)+1)*(prime(11)-1)=(23+1)*(31-1)=720. MAPLE seq((ithprime(i)+1)*(ithprime(i+2)-1), i=1..100); # Robert Israel, Feb 19 2017 CROSSREFS Cf. A087106. Sequence in context: A289132 A348716 A098585 * A230355 A063975 A227895 Adjacent sequences: A087102 A087103 A087104 * A087106 A087107 A087108 KEYWORD nonn AUTHOR Reinhard Zumkeller, Aug 10 2003 STATUS approved

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

Last modified March 31 20:59 EDT 2023. Contains 361673 sequences. (Running on oeis4.)