90675

Appears in sequences

• 4-dimensional figurate numbers: a(n) = (5*n-1)*binomial(n+2,3)/4.at n=25A002418
• The larger companion to the deficient numbers in A212608.at n=27A212609
• Odd numbers n such that 2n/sigma(n) - 1 = 1/x for some positive integer x.at n=27A222263
• a(n) = binomial(floor(n/2),4) + (ceiling(n/2)-3)*binomial(floor(n/2),3).at n=55A234277
• Expansion of x*(1 + 3*x + x^2)/((1 - x)^5*(1 + x)^4).at n=49A287143
• Odd numbers k that have a divisor d such that sigma(d)*d is equal to k.at n=8A327599
• Number of 3-regular cubic partitions of n.at n=41A335602
• a(n) = A003961(n) * sigma(A003961(n)), where A003961 is fully multiplicative with a(p) = nextprime(p), and sigma is the sum of divisors function.at n=35A361467
• a(n) = A249670(A003961(n)).at n=35A361468