53290

Appears in sequences

• Composite numbers k+1 such that k*phi(k+1) is a perfect square.at n=33A069068
• Numbers which when multiplied by any repunit prime Rp give a Smith number.at n=36A104167
• Number of 5 X n 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=9A303317
• a(n) is the least integer h such that there exists a Pythagorean triple whose hypotenuse is h and whose other legs z satisfy A176774(z) = n.at n=18A343981