80262

Appears in sequences

• Numbers k whose decimal representation, read as a base-19 value and divided by k, yields an integer.at n=23A032569
• Numbers k such that the harmonic mean of the divisors of k is the square of a rational number.at n=16A074266
• Numbers k such that all the following properties hold: (i) k*reverse(k) is a square; (ii) k != reverse(k); (iii) k and reverse(k) are not both squares; and (iv) k and reverse(k) have the same number of digits.at n=27A082994
• Non-palindromes in A110751; that is, non-palindromic numbers n such that n and R(n) have the same prime divisors, where R(n) = digit reversal of n.at n=15A110819
• Numbers k such that sigma(k)*phi(k)*k is a square.at n=11A114079
• Column 3 of triangle A128545; a(n) is the coefficient of q^(3n+9) in the central q-binomial coefficient [2n+6,n+3].at n=13A128553
• Number of ways to place 2 nonattacking nightriders on an n X n toroidal board.at n=20A196812
• Numbers k such that the product of divisors of sigma(k) is divisible by the product of divisors of k.at n=37A219362
• Numbers such that the sum of divisors is twice the sum of the exponential divisors.at n=8A274205
• Nonsquare integers >= 2 for which the square of its largest prime factor equals the sum of the squares of its other prime factors, with multiplicity.at n=5A391874