51053

Appears in sequences

• a(n) = floor( tan(n)^2 ).at n=11A005657
• Numbers k such that 10*R_k + 3 is prime, where R_k is the repunit (A002275) of length k.at n=12A056654
• Interprimes which are of the form s*prime, s=19.at n=13A075294
• Number of compositions of n into distinct parts with exactly one descent.at n=39A241720
• Number of 2 X 2 matrices with all elements in {0,...,n} and prime determinant.at n=29A281315
• Irregular table: the n-th row polynomial is given by the formal power series expansion of Sum_{k >= 0} (1 + q)^(n*k + n^2)*Product_{j = 1..k} (1 - (1 + q)^(2*j-1)), n >= 1.at n=38A340882