680625

Appears in sequences

• Smallest natural number k such that periodic part of 1/sqrt(k) is n (or 0 if no such number exists).at n=12A037211
• Smallest natural number k such that periodic part of 1/sqrt(k) is n (or 0 if no such number exists).at n=21A037211
• Number of rooted identity trees with n nodes and 5 leaves.at n=15A055330
• Squares k (not ending in 0) such that the integer that is built up by concatenating the floors of the square roots of the two-digit numbers into which the original number is separated (from right to left) is the square root of the original number.at n=41A294497
• Non-Niven (or non-Harshad) numbers that are divisible by the square of the sum of the squares of their digits.at n=20A379981
• Nonmultiples of 10 that are divisible by the square of the sum of the squares of their digits.at n=34A379982