OFFSET
1,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..1000
FORMULA
EXAMPLE
a(1) = 1*1 = 1;
a(2) = 9*3 = 27;
a(3) = 15*5 = 75;
a(4) = 21*7 = 147;
a(5) = 25*9 = 225.
MAPLE
A014076 := proc(n) option remember; local a; if n = 1 then 1; else for a from procname(n-1)+2 by 2 do if not isprime(a) then return a; end if; end do: end if; end proc:
MATHEMATICA
A014076 := Select[Range[1, 10000, 2], PrimeOmega[#] != 1 &]; Table[A014076[[n]]*(2*n - 1), {n, 1, 50}] (* G. C. Greubel, Jul 27 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Jul 29 2009
EXTENSIONS
7279 replaced with 7259 by R. J. Mathar, Oct 10 2009
STATUS
approved