84049

Appears in sequences

• arctanh(arctan(x)+arcsin(x))=2*x+15/3!*x^3+721/5!*x^5+84049/7!*x^7...at n=3A012993
• a(0)=1, a(1)=1, a(n) = 17*a(n/2) for n=2,4,6,..., a(n) = 16*a((n-1)/2) + a((n+1)/2) for n=3,5,7,....at n=19A116523
• Indices of pentagonal numbers (A000326) which are also centered hexagonal numbers (A003215).at n=3A254136
• Numbers n such that n^2 = a^2 + b^5 (with integers a, b > 0) and gcd(a, b, n) = 1.at n=36A293284
• Number of partitions of n with up to four distinct kinds of 1.at n=41A320691