26280

Appears in sequences

• Least term in period of continued fraction for sqrt(n) is 9.at n=21A031433
• First differences of A069475, successive differences of (n+1)^6-n^6.at n=34A069476
• (Sum of digits of n)^5 - (sum of digits^5 of n).at n=18A069965
• Number of two-rowed partitions of length 5.at n=29A070558
• a(1)=3; a(2n), a(2n+1) are smallest integers > a(2n-1) such that a(2n-1)^2+a(2n)^2=a(2n+1)^2.at n=13A077034
• Smallest number having exactly n divisors that are not greater than the number's greatest prime factor.at n=20A087134
• Numbers that have exactly seven prime factors counted with multiplicity (A046308) whose digit reversal is different and also has 7 prime factors (with multiplicity).at n=12A109027
• a(1)=3; for n>1, a(n) is least number such that a(n) > a(n-1) and a(1)^2+...+a(n)^2 is a square.at n=7A127689
• a(0)=360, a(n)=a(n-1)+720 for n>=1.at n=36A140801
• Triangle T(n, k) = 1 if k = 0 or k = n, otherwise n^5 - k^5 - (n-k)^5, read by rows.at n=46A157634
• Triangle T(n, k) = 1 if k = 0 or k = n, otherwise n^5 - k^5 - (n-k)^5, read by rows.at n=53A157634
• a(n) = 81*n^2 + 2*n.at n=17A177099
• Smallest number k such that prime(n) is the n-th divisor of k.at n=19A221647
• Least positive integer k such that both k and k*n belong to the set {m>0: prime(prime(m))-prime(m)+1 = prime(p) for some prime p}.at n=50A260753
• Numbers k such that (185*10^k + 7)/3 is prime.at n=21A281911
• Number of (unlabeled) rooted trees with n leaf nodes and without unary nodes such that the maximum of the node outdegrees equals four.at n=9A292230
• Smallest number whose largest odd noncomposite divisor is its n-th divisor.at n=20A384232
• Numbers k for which there exists m such that the sum from 1 to m and the sum from m + 1 to k are both perfect squares.at n=31A388659