OFFSET
0,2
LINKS
Eric Weisstein's World of Mathematics, Distinct Prime Factors
Eric Weisstein's World of Mathematics, Tetranacci Number
FORMULA
EXAMPLE
a(4) = 39648, because 39648 is a tetranacci number with 4 distinct prime factors {2, 3, 7, 59} and this is the smallest such number.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jan 15 2023
EXTENSIONS
a(11) from Daniel Suteu, Jan 18 2023
STATUS
approved