OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (3, -3, 1).
FORMULA
Conjecture: a(n) = A098603(n), n > 20. [R. J. Mathar, Jul 31 2010]
MAPLE
A033676 := proc(n) local dvs; dvs := sort(convert(numtheory[divisors](n), list)) ; op(floor((nops(dvs)+1)/2) , dvs) ; end: A163280 := proc(n, k) local r, T ; r := 0 ; for T from k^2 by k do if A033676(T) = k then r := r+1 ; if r = n then RETURN(T) ; fi; fi; od: end: printf("0, ") ; for n from 1 to 70 do printf("%d, ", A163280(11, n)) ; end do ; # R. J. Mathar, Feb 05 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Aug 08 2009
EXTENSIONS
Extended by R. J. Mathar, Feb 05 2010
STATUS
approved