56250000

Appears in sequences

• Squares that remain squares if prefixed with a 1.at n=7A167035
• Squares that remain squares when prefixed with a 7.at n=7A167042
• Numbers n such that n^3 has n as its middle digits.at n=23A227548
• Numbers n such that Sum_{i=1..j} 1/pn(i) + Sum_{i=1..k} 1/pd(i) is an integer, where pn are the prime factors of n and pd the prime factors of the arithmetic derivative of n, both counted with multiplicity.at n=18A239490