A179899 Integers of the form A179896(n)/A141468(n+1).

0, 12, 21, 30, 36, 39, 48, 51, 57, 66, 72, 75, 81, 84, 93, 96, 102, 111, 114, 120, 126, 129, 135, 138, 141, 147, 156, 165, 171, 174, 177, 180, 183, 186, 192, 198, 201, 210, 213, 216, 219, 228, 231, 237, 240, 246, 252, 255, 261, 264, 273, 276, 279, 282, 291

Offset

1,2

Links

Nathaniel Johnston, Table of n, a(n) for n = 1..10000

Example

0 = 0/1, 12 = 108/9, 21 = 315/15, 30 = 630/21, 36 = 900/25 and so on.

Maple

ithnonprime := proc(n)local k: option remember: if(n=1)then return 1: else k := procname(n-1)+1: while true do if(not isprime(k))then return k fi: k:=k+1: od: fi: end: A179899ind := proc(n) option remember: local k: if(n=1)then return 1:fi: for k from procname(n-1)+1 do if(ithnonprime(k) mod 2 <> 0)then return k: fi: od: end: A179899 := proc(n) return 3*(ithnonprime(A179899ind(n))-1)/2: end: seq(A179899(n), n=1..55); # Nathaniel Johnston, May 05 2011

Crossrefs

Cf. A000040, A179545, A179896.

Sequence in context: A199981 A274347 A316266 * A085926 A071263 A241503

Adjacent sequences: A179896 A179897 A179898 * A179900 A179901 A179902

Keyword

easy,nonn

Author

Odimar Fabeny, Jul 31 2010

Extensions

More terms from Odimar Fabeny, Aug 12 2010

Definition rephrased by R. J. Mathar, Sep 01 2010

Status

approved