A329762 a(1) = 1; thereafter a(n+1) > a(n) is the smallest multiple of a(n) using only odd digits but not divisible by 3.

1, 5, 35, 175, 7175, 179375, 17399375, 51797939375, 3315119917939375, 93137793511399131779375, 79375315115111911957537791599375, 55751171777397357155597571713137115337799375

Offset: 1

Author

Chai Wah Wu, Dec 04 2019

Keywords

• nonn
• base

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

Cf. A078221, A078223.