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

Author

Odimar Fabeny, Jul 31 2010

Keywords

• easy
• nonn

Examples

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

Links

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

Crossrefs

Cf. A000040, A179545, A179896.

Programs

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

Extensions

More terms from Odimar Fabeny, Aug 12 2010

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