2989441

Appears in sequences

• Palindromic squares in base 12.at n=15A029738
• Numbers whose square can be expressed as the sum of two positive cubes in more than one way.at n=6A051302
• a(n)=sigma(A128607(n)), where A128607(n) is the sequence of perfect (or pure) powers such that a(n) is a perfect power.at n=5A128608
• Powers of 1729, the Hardy-Ramanujan number.at n=2A138130
• Numbers n such that n^2 can be expressed as the sum of 2 positive cubes in exactly 2 different ways.at n=6A145553
• Smallest m such that m can be written in exactly n ways as x^2 + xy + y^2 with 0 <= x <= y.at n=14A198799
• Odd squares which are the sum of the divisors of some n.at n=6A243810
• Smallest nonnegative number k such that k can be written in exactly n ways as x^2 + xy + y^2 where x and y are positive integers, with x >= y.at n=13A300419
• Perfect powers y^m with y > 1 and m > 1 which are Brazilian repdigits with three or more digits > 1 in some base.at n=13A307745
• Squares m such that beta(m) = (tau(m) - 1)/2 where beta(m) is the number of Brazilian representations of m and tau(m) is the number of divisors of m.at n=15A326710
• Smallest k such that circle centered at the origin and with radius sqrt(k) passes through exactly 6*n integer points in the hexagonal lattice (see A004016).at n=26A343771
• Numbers of the form (q1^b1)(q2^b2)(q3^b3)(q4^b4)(q5^b5)... where q1=7, q2=13, q3=19, q4=31, q5=37, ... (A002476) and b1>=b2>=b3>=b4>=b5...at n=29A344473