511488

Appears in sequences

• The greedy sequence of real numbers at least 1 that do not contain any 4-term geometric progressions with integer ratio.at n=26A235055
• Numbers k for which the repeating part with leading 0's of 1/k in decimal is a palindrome and longer than one digit.at n=8A382638
• a(n) = Sum_{k=0..floor(n/3)} 2^k * 3^(n-3*k) * binomial(k,2*(n-3*k)).at n=31A390775