81075

Appears in sequences

• Numbers with exactly one arithmetic progression of four successive divisors (not necessarily consecutive).at n=36A094530
• Numbers k such that k*(k+1)-1 and k*(k+1)+1 are twin primes and k*(k+3)-1 and k*(k+3)+1 are also twin primes.at n=32A138303
• Numbers k which can be split into two numbers x and y such that x^3 + y^2 is a multiple of k.at n=48A162451
• Number of binary strings of length n with no substrings equal to 0010 1001 or 1010.at n=17A164500
• Number of 2 X 2 matrices having all terms in {1,...,n} and determinant d satisfying -n < d < n.at n=28A211070
• Numbers k such that k=(a+b)*c=a*b+c for more than one triple (a,b,c) with 1<c<a<=b.at n=7A329169