
COMMENTS

The next term is too large to display.
With the exception of 7 there are no primes in this sequence.
All numbers in this sequence are squarefree.
a(n) is divisible by a(k) for every k < n.
The sequence of number of digits of a(n), n >= 1, is 1, 1, 1, 4, 15, 47, 144, 436, 1313, 3946, 11846, 35546, 106648, 319954, 959872, 2879628, 8638896, 25916701, 77750117, 233250368, 699751120,...  Wolfdieter Lang, Feb 21 2014
Each a(n) is by definition the same as the repetend of 1/3^n, viewed as a binary integer. E.g., 1/9 = .000111000111...; consequently a(2) = 000111 (base 2) = 7 (base 10)  Joe Slater, Nov 29 2016
