28544

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+10).at n=29A015880
• Admirable numbers such that the subtracted divisor is square.at n=13A109806
• McKay-Thompson series of class 20A for the Monster group.at n=25A112158
• a(n) = (n^6 - 30*n^4 + 45*n^3 + 206*n^2 - 576*n + 384)/6.at n=6A135917
• Abundant numbers n such that n/(sigma(n)-2n) is an integer.at n=30A153501
• a(n) = ((5+sqrt(3))*(1+sqrt(3))^n + (5-sqrt(3))*(1-sqrt(3))^n)/2.at n=9A162562
• Numbers with abundance 32.at n=4A175989
• Abundant numbers n for which the abundance d = sigma(n) - 2*n is a proper divisor, that is, 0 < d < n and d | n.at n=28A181595
• Numbers m with divisor 32 | m and abundance sigma(m)-2*m = 32.at n=1A181601
• Near-perfect numbers (A181595) of the form 2^(t-1)*(2^t-2^k-1), where 2^t-2^k-1 is prime, k>=1, t>k.at n=13A181701
• Numbers of the form m=2^(t-1)*(2^t-33), where 2^t-33 is prime.at n=1A181707
• McKay-Thompson series of class 20A for the Monster group with a(0) = 4.at n=25A210459
• Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 6.at n=2A233674
• Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 6.at n=2A233677
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 6 (6 maximizes T(1,1)).at n=12A233682
• Number of length n+5 0..1 arrays with at most two downsteps in every n consecutive neighbor pairs.at n=13A256820
• Expansion of Product_{k>=0} 1/(1-x^(3*k+1))^4.at n=20A261635
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 437", based on the 5-celled von Neumann neighborhood.at n=14A282217
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 41", based on the 5-celled von Neumann neighborhood.at n=14A285547
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 369", based on the 5-celled von Neumann neighborhood.at n=14A287859