25725

Appears in sequences

• Powers of fourth root of 15 rounded up.at n=15A018089
• a(n) = 21*n^2.at n=35A064762
• 7-smooth numbers using digits 2,3,5 and 7 only. Numbers using prime digits and having prime divisors < 10.at n=17A085907
• 7-smooth numbers containing only noncomposite digits (1,2,3,5,7).at n=41A113623
• Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 7.at n=43A137004
• Numbers with exactly 3 distinct odd prime divisors {3,5,7}.at n=23A147576
• Terms in A046034 which are pairwise products of terms in A046034.at n=26A153446
• Triangle read by rows, defined by T(n,k)=binomial(n,k)*|Stirling1(n,k)|, 0<=k<=n.at n=32A187555
• Numbers k such that between k and the next prime there are gpf(k) numbers, where gpf(k) denotes the largest prime factor of k.at n=20A235425
• Partition array in Abramowitz-Stegun order for the number of ways of putting n stones into a rectangular m X n grid of squares such that each of the m rows contains at least one stone.at n=35A258152
• a(n) = gcd(A260443(n), A260443(n+1)).at n=50A277198
• Square root of the prime factor form (A276086) of the primorial base expansion, computed for such numbers for which it is a square.at n=23A328834
• For any number n with binary expansion Sum_{k = 1..m} 2^e_k (where 0 <= e_1 < ... < e_m), a(n) = Product_{k = 1..m} prime(1+e_k)^k (where prime(k) denotes the k-th prime number).at n=14A344530
• Numbers whose k-th arithmetic derivative is zero for some k>0, ordered by their position in A276086.at n=43A351255
• a(n) is the smallest number k in the sorted sequence S(q) = {k : rad(k) = q}, q = A120944(n), such that tau(k) - A008479(k) is not positive, where rad = A007947 and tau = A000005.at n=36A373737
• a(n) = n! * [x^n] (-2 - exp(-x))^n.at n=5A375542
• Numbers k such that the sum of the digits of k equals the sum of its prime factors plus the sum of the multiplicities of each prime factor.at n=41A376157
• a(n) = Sum_{k=0..n} k^5 * 2^(n-k) * binomial(n,k).at n=5A383139
• Composite numbers that contain only prime digits and whose prime factors contain only prime digits.at n=37A387093
• Positive integers k = p_1^e_1*p_2^e_2*p_3^e_3, such that the points (p_1, e_1), (p_2, e_2) and (p_3, e_3) lie on a straight line with nonzero slope.at n=5A389340