1032256

Appears in sequences

• Sum of 2nd, 4th, 6th, 8th and 10th powers of divisors are divisible by sum of divisors.at n=26A074471
• Numbers of the form m*(2^k-1), where m = 2^(k-1)*(2^k-1) is a perfect number (A000396).at n=3A181711
• Integers m such that A240923(m) = 1, where A240923(n) = numerator(sigma(n)/n) - sigma(denominator(sigma(n)/n)).at n=21A240991
• Primitive numbers whose abundance is positive and odd.at n=41A259231
• Squares that are also pentagonal pyramidal numbers.at n=8A277792
• p-INVERT of A079977, where p(S) = 1 - S - S^2.at n=18A289845
• a(n) is the largest positive integer that is abundant and has the same prime signature as A025610(n) or 0 if no such number exists.at n=23A343329
• Primitive abundant numbers (A091191) that are powerful numbers (A001694).at n=4A363176
• Perfect powers k such that A052409(k) is equal to A052409(A366275(k)).at n=41A366278
• Numbers that have exactly one Zumkeller divisor but are not Zumkeller.at n=32A376877
• a(n) is the least m > 0 such that sigma(m) - 2m = A140863(n).at n=14A380866
• a(n) is the least k that is a multiple of d=A240991(n), with abundancy ratio sigma(k)/k equal to (sigma(d)+1)/d, or -1 if no such k exists.at n=9A387405
• Numbers k such that sigma(A253560(k)) / A253560(k) is equal to (sigma(k)+1) / k, where A253560(k) = k multiplied by its largest prime factor.at n=30A387406
• Detour index of the n X n black bishop graph.at n=15A387645