20065

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 81.at n=19A020420
• Numbers k such that 159*2^k + 1 is prime.at n=32A032456
• a(n) = Sum_{i=0..n} A047080(i,n-i).at n=24A047084
• Numbers n such that 4*10^n + R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=12A102982
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 6.at n=46A136898
• Solutions to the simultaneous equations m(n)+1=a(n)^2 and 7*m(n)+1=b(n)^2.at n=7A161852
• Number of nondecreasing arrangements of n numbers in -6..6 with sum zero and sum of squares less than n*42/3.at n=10A183932
• Number of n X n 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.at n=5A224152
• Number of nX6 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.at n=5A224156
• Number of 6Xn 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.at n=5A224162
• Denominators of the other-side convergents to sqrt(7).at n=15A259596
• Triangle read by rows: row n gives coefficients of Schur polynomial Omega(n) in order of decreasing powers of x.at n=74A269750
• Semiprimes whose binary and ternary representations are prime when read in decimal.at n=23A279052
• G.f.: Product_{m>0} (1 + x^m + 2!*x^(2*m) + 3!*x^(3*m) + 4!*x^(4*m) + 5!*x^(5*m)).at n=15A293250