53280

Appears in sequences

• Expansion of tanh(x)/cosh(log(1+x)).at n=10A009842
• At these values of k, the 1st, 2nd, 3rd and 4th cyclotomic polynomials all give prime numbers.at n=8A070025
• Least number m such that cardinality of InvPhi(m) = prime(n).at n=27A071389
• Triangle read by rows: T(n,k) is the number of binary sequences of length n containing k subsequences 0110 (n,k >= 0).at n=53A118890
• Number of binary sequences of length n containing exactly one subsequence 0110.at n=17A118892
• Numbers with prime factorization pqr^2s^5.at n=22A190293
• a(n) = number of triangles that can be formed from the points of a 3 X n grid.at n=23A262402
• Number of (n+1) X (6+1) arrays of permutations of 0..n*7+6 with each element having index change +-(.,.) 0,0 0,2 or 1,2.at n=1A264130
• T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having index change +-(.,.) 0,0 0,2 or 1,2.at n=22A264131
• Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 0,2 or 1,2.at n=5A264133
• Coefficients in expansion of -q*E'_4/E_4 where E_4 is the Eisenstein Series (A004009).at n=1A289636
• "Erase or triple": list of the successive integers that produce the next "altitude" record (see the comments section).at n=19A300150