25308

Appears in sequences

• Orders of noncyclic simple groups (without repetition).at n=19A001034
• Index of (the image of) the modular group Gamma(n) in PSL_2(Z).at n=36A001766
• a(n) = n*(n+1)*(n+2)/2.at n=36A027480
• a(n) = lcm(n,n+1,n+2).at n=35A033931
• Denominator of b(n)-b(n+1), where b(n) = n/((n+1)(n+2)) = A026741/A045896.at n=34A051713
• McKay-Thompson series of class 26A for Monster.at n=33A058596
• Numbers k such that phi(k) = bigomega(k)*tau(k)^2.at n=31A068540
• Product of all n - d, where d < n and d is a divisor of n.at n=37A072513
• Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly five ways.at n=7A076458
• Rearrangement of positive integers so that the successive ratios (of the larger to the smaller term) are all distinct integers. a(m)/a(m-1) = a(k)/a(k-1) iff m = k (assuming a(m) > a(m-1), otherwise the ratio a(m-1)/a(m) is to be considered). Priority is given to smallest number not included earlier rather than to the successive ratio that has not occurred earlier.at n=51A084337
• Number of edges in LCM of graphs K_n and C_4.at n=36A098585
• Orders of non-cyclic simple groups (with repetition).at n=20A109379
• a(1) = 6; for n>1, a(n) = prime(n)*(prime(n)^2 - 1)/2.at n=11A117762
• Half of product of three numbers: n-th prime, previous and following number.at n=11A127918
• Numbers k such that k^2 divides 3*Fibonacci(k).at n=7A130164
• a(n) = n*(n^2 - 1)/2.at n=37A135503
• Orders of simple groups which are non-cyclic and non-alternating.at n=16A137863
• a(n) = phi(n)*T(n), where phi(n) is Euler's totient function (A000010) and T(n) = n*(n+1)/2 is the n-th triangular number (A000217).at n=36A143268
• a(n) = binomial(n+1,2)*6^2.at n=37A162940
• A121153 \ A005836.at n=11A170830