85680

Appears in sequences

• Weight distribution of [ 17,9,7 ] code over GF(4).at n=13A014488
• Numbers k such that sigma(k) >= 4*k.at n=9A023198
• Expansion of e.g.f. (2+x-x^2)/(1-x)^2.at n=7A052649
• Expansion of e.g.f.: exp(x^2/(1 - x)^2).at n=7A052887
• Denominator of sum of first n terms of the series 1/15 + 1/63 + 1/80 ... in which the denominators are perfect squares - 1 which are simultaneously other powers, e.g. a(1) = 15 because 16 = 4^2 = 2^4, a perfect square that is also a fourth power; hence 16-1 = 15 qualifies as a term.at n=3A062757
• Denominator of sum of first n terms of the series 1/3 + 1/8 + 1/24 ... in which the denominators are one less than a perfect square that cannot otherwise be written as a power (cf. A062757, A037450).at n=14A062834
• Numbers k such that sigma(k) > 4*k.at n=7A068404
• Compute S, the number of different quadratic residues modulo B for every base B. If the density S/B is smaller for B than for every B' less than B, then B is added to the sequence.at n=42A085635
• Number of conjugacy classes in the group GL(3,Z_n).at n=44A086768
• Smallest number having exactly n divisors d such that also d+2 is a divisor.at n=21A099476
• Smallest perimeter S such that exactly n distinct Pythagorean triangles with this perimeter can be constructed.at n=36A099830
• Numbers n such that the denominator of BernoulliB(n) is a record.at n=45A100195
• Array read by antidiagonals: T(m,n) = Sum_{i=1..m} i*(n-1+i)!.at n=29A100630
• Table read by antidiagonals: T(m,n) gives the ordinal number in the table of permutations of length n+1 of the permutation which reverses the first m+1 items on a list of length n+1, leaving the remaining items unaltered. For example, T(5,7) is 28494 and the 28494th row of the permutation table of order 8 is 5 4 3 2 1 0 6 7.at n=36A100711
• Highly abundant numbers (A002093) that are not Harshad numbers (A005349).at n=4A128702
• a(n) = (2*n+1)*(n-1)!.at n=7A129326
• Expansion of psi(-x^3) / phi(-x) in powers of x where psi(), phi() are Ramanujan theta functions.at n=32A132218
• Binomial transform of A045621.at n=10A134377
• A triangular sequence of coefficients from a three level exponential expansion function: f(x,t) = log(1 + t)*(1 - t)*exp(x*(t - t^2)).at n=37A137455
• Coefficients of a symmetric matrix representation of the 9th falling factorial power, read by antidiagonals.at n=67A145836