84360

Appears in sequences

• a(n) = floor(n*(n-1)*(n-2)*(n-3)/21).at n=38A011931
• a(n) = floor( n*(n-1)*(n-2)*(n-3)/26 ).at n=40A011936
• Numbers k such that sigma(k) divides k^2.at n=31A090777
• a(n) = Sum_{k=1..n} k*(prime(k) - k).at n=35A110477
• Numbers n for which the terms of the multiplicative sequence {n^2/A049417(n)} are integers.at n=38A185288
• Antidiagonal sums of the convolution array A213778.at n=35A213780
• Number of compositions of n with difference -4 between the number of odd parts and the number of even parts, both counted without multiplicity.at n=15A242837