26505

Appears in sequences

• Sum of 10 nonzero 8th powers.at n=39A003388
• a(n) = n(n+7)(n+1)(n^2+2n+12)/120.at n=17A051746
• a(n) = ((2^b-1)/phi(n))*Sum_{d|n} Moebius(n/d)*d^(b-1) for b = 4.at n=34A160892
• Number of (w,x,y,z) with all terms in {1,...,n} and w > x < y >= z.at n=19A212501
• Least positive integer m such that m*n divides sigma(m^2+n^2), where sigma(k) is the sum of all positive divisors of k.at n=15A248189
• Product_{n>=1} (1 + x^n)^a(n) = g.f. of A001970 (partitions of partitions).at n=37A305841
• a(1) = 1; for n > 1, a(n) = n*a(n-1) if n is a prime, otherwise a(n) = floor(a(n-1)/A020639(n)), where A020639(n) is the smallest prime divisor of n.at n=30A330252
• a(n) = binomial(n,2)*(binomial(n-1,2) + 2).at n=18A352405
• a(n) is the smallest number k with exactly n of its divisors in A052294.at n=17A363463