OFFSET
0,2
LINKS
Eric Weisstein's World of Mathematics, Prime Factor
Eric Weisstein's World of Mathematics, Tetranacci Number
EXAMPLE
a(6) = 5536, because 5536 is a tetranacci number with 6 prime factors (counted with multiplicity) {2, 2, 2, 2, 2, 173} and this is the smallest such number.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jan 16 2023
STATUS
approved