50279

Appears in sequences

• Number of binary rooted trees with n nodes and height exactly 6.at n=26A036595
• Mean (rounded) of composite numbers below 10^n.at n=4A092802
• Numbers for which the root mean square of nontrivial divisors is an integer and which are not a square of prime numbers.at n=47A247137
• a(n) gives the odd leg of the second of the two Pythagorean triangles with hypotenuse A080109(n) = A002144(n)^2. This is the larger of the two possible odd legs.at n=26A253804
• a(0) = a(1) = 1, and a(n) = a(n-1) + a( (a(n-1)-1) mod n ) for n>=2.at n=43A268176
• Positions of records in A204911.at n=20A317249
• a(n) = coefficient of x^n in A(x) where x = Sum_{n=-oo..+oo} (-1)^(n-1) * x^(n*(n+1)) * A(x)^(n^2).at n=12A359669