OFFSET
1,1
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
FORMULA
a(n) ~ 6n log n / (log log n)^3. - Charles R Greathouse IV, May 04 2013
EXAMPLE
a(1) = 1023456987 = 3^2 * 7 * 16245349.
a(2) = 1023458679 = 3^3 * 37905877.
a(3) = 1023458967 = 3^2 * 113 * 1006351.
a(4) = 1023465897 = 3^2 * 6379 * 17827.
a(5) = 1023465987 = 3^2 * 53 * 2145631.
a(511032) = 10123456987 = 7^2 * 9833 * 21011.
PROG
(PARI) is(n)=#vecsort(digits(n), , 8)>9 && bigomega(n)==4 \\ Charles R Greathouse IV, May 04 2013
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Jonathan Vos Post, May 04 2013
EXTENSIONS
a(6)-a(23) from Charles R Greathouse IV, May 04 2013
STATUS
approved