89280

Appears in sequences

• Values of phi(k) when phi(k) = phi(k+1).at n=41A003275
• [ n(n-1)(n-2)(n-3)/11 ].at n=33A011921
• a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes allowed).at n=28A032736
• a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes and suffixes are allowed).at n=19A032738
• Triangle, read by rows, where T(0,0) = 1, T(n,k) = 2^n*T(n-1,k) + T(n-1,k-1).at n=24A108084
• Sigma(A033631(n)) {sigma is the sum of divisors function A000203}.at n=16A115619
• Number of polynomials in two noncommuting variables over the field F_2 having complexity or rank n.at n=5A120331
• Numbers k such that if you subtract k-reversed from k you get a natural number with the same digits as k.at n=29A121969
• Numbers with prime factorization pqr^2s^6.at n=17A190474
• Number of ways to arrange n women and n men around a circular table so that they can be divided into n nonintersecting pairs of 1 woman and 1 man sitting side-by-side.at n=5A273935
• Triangle read by rows: T(n, k) = Sum_{i=1..n-k} inverse-q-binomial(n-k-1, i-1) * q-binomial(n-2+i, n-2) for 0 < k < n with initial values T(n, 0) = 0 for n > 0 and T(n, n) = 1 for n >= 0, here q = 2.at n=32A355401
• Number of permutations of [n] having the maximal possible number of pairs of integers i<j in [n] such that their cycle minima have opposite sorting order.at n=18A381531
• Dimensions of the homogeneous component of degree n of the free unital Jordan algebra on 3 generators.at n=11A382233