OFFSET
1,2
COMMENTS
Or, positive integers relatively prime to 510510 = 2*3*5*7*11*13*17.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
Eric Weisstein's World of Mathematics, Rough Number
Index entries for sequences related to smooth numbers [From Michael B. Porter, Oct 10 2009]
FORMULA
a(n) = k*n + O(1) where k = 17017/3072 = 5.539388.... In particular, k*n - 31 < a(n) < k*n + 25. - Charles R Greathouse IV, Sep 24 2018
EXAMPLE
437 = 19 * 23 is in the sequence since the two prime factors, 19 and 23, are not less than 19.
MATHEMATICA
Join[{1}, Select[Range[300], Min[Transpose[FactorInteger[#]][[1]]]>18&]] (* Harvey P. Dale, Feb 18 2015 *)
PROG
(PARI) isA166061(n) = gcd(n, 510510)==1 \\ Michael B. Porter, Oct 10 2009
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Michael B. Porter, Oct 05 2009
STATUS
approved