OFFSET
1,7
COMMENTS
The union of A115090 is the complement of A007921: numbers that are not the difference of two primes. - Robert G. Wilson v, Mar 09 2006
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
FORMULA
EXAMPLE
12, the 4th nonsquarefree positive integer, is 2^2 * 3. 3 is the largest prime dividing 12. 2 is the smallest prime dividing 12. So a(4) = 3 - 2 = 1.
MATHEMATICA
(Max@# - Min@#) & /@ (First /@ FactorInteger@# & /@ Select[ Range@243, !SquareFreeQ@# &]) (* Robert G. Wilson v, Mar 09 2006 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Mar 01 2006
EXTENSIONS
More terms from Robert G. Wilson v, Mar 09 2006
STATUS
approved