408321

Appears in sequences

• Numbers k having exactly one divisor d such that in binary representation d and k/d have the same number of 1's as k.at n=26A080026
• Square numbers of the form prime(k) + 2*prime(k+1).at n=25A284057
• Odd squares k for which A379113(k) > 1, i.e., k that have a proper unitary divisor d > 1 such that A048720(A065621(sigma(d)),sigma(k/d)) is equal to sigma(k).at n=10A379121