108312

Appears in sequences

• a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes and suffixes are allowed).at n=28A032738
• a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 3, and a(3) = 1.at n=18A049918
• a(n) = a(n-1) + (sum of the terms, from among the first (n-1) terms of the sequence, which are coprime to the n-th Fibonacci number).at n=15A131788