OFFSET
1,2
COMMENTS
Equivalently, the sequence is defined as a(1) = 1, a(2) = 5, and for n > 1, a(n+1) > a(n) is the smallest multiple of a(n) using only odd digits. All terms besides a(1) are divisible by 5.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Chai Wah Wu, Dec 04 2019
STATUS
approved