218089

Appears in sequences

• Squares which are palindromes in base 15.at n=21A030075
• a(n) = prime^2 and digits of prime do not appear in a(n).at n=20A030088
• Numbers k such that sigma(k)*phi(k) is squarefree.at n=36A065299
• Odd squares not in A113659.at n=15A103962
• Squares for which both the sum of the digits and the product of the digits is a triangular number.at n=29A118490
• Numbers k of the form q^2, q = prime, such that k-2 is a prime.at n=32A146981
• Smaller prime power associated with record gap in A167186.at n=23A167188
• Squares that becomes a prime number when prefixed with a 9.at n=30A167724
• Numbers n such that (the sum of the divisors of n) plus (the sum of the squares of the divisors of n) plus (the sum of the cubes of the divisors of n) is a prime number.at n=17A220586
• a(n) is the number k such that A383653(n)^4 is the sum of squares of k consecutive integers.at n=12A383654