260100

Appears in sequences

• Sigma(n) / d(n) is a perfect square associated with A049226.at n=31A049227
• Squares arising in A063076.at n=13A063082
• Numbers k such that the numerator of Sum_{d|k} 1/d > 3*k.at n=16A069096
• Squares for which the sum of the digits, the product of the digits, the digital root and the multiplicative digital root are all squares.at n=31A117680
• a(1)=1; at n>=2, a(n) = least square > a(n-1) such that sum a(1)+...+a(n) is a prime number.at n=24A139033
• Squares which are anagrams of cubes.at n=22A161860
• Squares of Bernoulli number denominators A027642.at n=16A172282
• Squares of Bernoulli number denominators A027642.at n=32A172282
• Numbers k such that k^k == 1 (mod sigma(k)).at n=21A181476
• Numbers with prime factorization p^2*q^2*r^2*s^2 where p, q, r, and s are distinct primes.at n=4A190377
• Composite numbers whose number of proper divisors has a number of proper divisors which has a prime number of proper divisors.at n=8A223457
• Let x(0)x(1)x(2)... x(q) denote the decimal expansion of n. Sequence lists the numbers n such that the suffix of decimal expansion x(2)... x(q) is the p-th divisor of n where p is the prefix of decimal expansion x(0)x(1).at n=29A234315
• Numbers n such that there exists an m so that squarefree kernel of n = squarefree kernel of m, and n is the sum of the proper divisors of m (m may equal n).at n=31A252234
• Number of (n+2) X (7+2) 0..1 arrays with no 3 X 3 subblock diagonal sum less than the antidiagonal sum or central row sum less than the central column sum.at n=17A258893
• Numbers n such that 2^n == 1 (mod sigma(n)).at n=38A278836
• Squares in whose primorial base expansion only even digits appear.at n=48A328850
• Numbers having exactly four non-unitary prime factors.at n=9A338541
• Squares that are divisible by both the sum of their digits and the product of their nonzero digits.at n=31A339999
• Squares that are divisible by the product of their nonzero digits.at n=38A346537
• Numbers k such that (65*k)^2 can be represented in exactly 4 ways as the sum of a positive square and a positive fourth power.at n=8A346594