OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = 4*A002473(n). - Robert Israel, Mar 18 2018
Sum_{n>=1} 1/a(n) = 35/32. - Amiram Eldar, Sep 23 2024
MAPLE
N:= 1000: # to get all terms <= N
sort([seq(seq(seq(seq(2^a*3^b*5^c*7^d, d=0..floor(log[7](N/(2^a*3^b*5^c)))), c=0..floor(log[5](N/(2^a*3^b)))), b=0..floor(log[3](N/2^a))), a=2..floor(log[2](N)))]); # Robert Israel, Mar 18 2018
MATHEMATICA
Select[4Range[150], Last[FactorInteger[#]][[1]]<10&] (* Harvey P. Dale, Aug 24 2011 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Amarnath Murthy, Jul 06 2003
EXTENSIONS
More terms from David Wasserman, Jan 28 2005
Offset changed by Robert Israel, Mar 18 2018
STATUS
approved