76776

Appears in sequences

• E.g.f.: arctan(arctanh(x)*exp(x))=x+2/2!*x^2+3/3!*x^3-12/4!*x^4-147/5!*x^5...at n=8A012713
• Starting positions of strings of four 8's in the decimal expansion of Pi.at n=8A083638
• Smallest multiple of A047201(n) (i.e., numbers not divisible by 5) with only digits 6 and 7.at n=33A124476
• Triangle read by rows: T(n,k) is the sum of the number of the arrangements of p_1 1's, p_2 2's, ..., p_k k's (p_1 + p_2 + ... + p_k = n and p_1 >= p_2 >= ... >= p_k) avoiding equal consecutive terms, where 1 <= k <= n.at n=49A321686
• Choose two different numbers x and y from 2 to 9. a(n) is the number that consists solely of the digits x or y and is the smallest number divisible by both of them.at n=16A380568
• a(n) = Sum_{k=0..n} 2^(n-k) * binomial(n,k) * binomial(2*n+2*k,k).at n=5A388912