OFFSET
1,1
LINKS
David A. Corneth, Table of n, a(n) for n = 1..10000
EXAMPLE
2677277333530800000 = 2^7 * 3^6 * 5^5 * 7^4 * 11^3 * 13^2 * 17 is in the sequence. There are exactly 7 distinct exponents; 1 through 7 in it.
PROG
(PARI) is(n) = #Set(factor(n)[, 2]) == 7
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
David A. Corneth, Feb 17 2019
STATUS
approved