23750

Appears in sequences

• Least term in period of continued fraction for sqrt(n) is 9.at n=20A031433
• Number of ternary codes of length 9 with n words.at n=4A034221
• Number of ternary codes (not necessarily linear) of length n with 4 words.at n=8A034224
• Product of n with sum of next n consecutive integers.at n=24A036659
• Schoenheim bound L_1(n,n-5,n-6).at n=22A036837
• a(n) = binomial(n+5,4) - 1.at n=24A063258
• Numbers k such that S(k)=d(k), where S(k) is the Kempner function (A002034) and d(k) is the number of divisors of k (A000005).at n=20A073307
• Numbers n such that number of divisors of n divides S(n), the Kempner function A002034.at n=31A073413
• Sum of the prime factors of k equals half the sum of the prime factors of k + 1.at n=15A074213
• Triangle, read by rows, where g.f. of row n equals the product of (1-x)^n and the g.f. of the coordination sequence for root lattice B_n, for n >= 0.at n=40A109001
• Expansion of (1 -5*x +5*x^2)/((1 -2*x)*(1 -4*x +x^2)).at n=10A123020
• Number of ways to build a contiguous building with n LEGO blocks of size 2 X 2 on top of a fixed block of the same size so that the building is symmetric after a rotation by 180 degrees.at n=8A123822
• Alternate terms of A001263 as polynomials divided by x+1 to give a new triangle of coefficients of even powered polynomials.at n=39A136267
• Alternate terms of A001263 as polynomials divided by x+1 to give a new triangle of coefficients of even powered polynomials.at n=45A136267
• Triangle T where the g.f. of row n of T^(2n) = (2n^2 + y)^n for n>=0, as read by rows, where T^n denotes the n-th matrix power of T.at n=17A177390
• Column 2 of triangle A177390.at n=3A177393
• a(n) = (binomial(n,5) - floor(n/5)) / 5.at n=23A215052
• Value of x for solution of 5^n = x^2 + y^2 with closest x and y (n >= 0, 0 <= x < y).at n=13A236571
• On a spirally numbered square grid, with labels starting at 1, this is the number of the last cell that an (n,n+1) leaper reaches before getting trapped, or -1 if it never gets trapped.at n=15A343179
• Expansion of (1/x) * Series_Reversion( x / ((1+x)^5-x^5) ).at n=5A369157