26980

Appears in sequences

• Matrix inverse of triangle A055340(n+1,k).at n=55A055347
• Column 1 of triangle A055347.at n=10A055348
• a(n) = (1/12)*(n+1)*(n^3+19*n^2+118*n+228).at n=20A092327
• Numbers n such that 4*10^n + 5*R_n + 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=13A102993
• Numbers n such that sigma(n) = 6*phi(n).at n=9A104900
• Consider the array T(n, m) where the n-th row is the sequence of integer coefficients of A(x), where 1<=a(n)<=n, such that A(x)^(1/n) consists entirely of integer coefficients and where m is the (m+1)-th coefficient. This is the row sum of A to the first coefficient of one.at n=33A112285
• Expansion of -x*(1+x-x^2+x^3+4*x^4) / ( (x^3-2*x^2-x+1)*(x^3+2*x^2-x-1) ).at n=17A120391
• a(n) = 1000*n - 20.at n=26A157515
• Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 1 0 vertically.at n=5A207482
• Number of nX6 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 1 0 vertically.at n=5A207486
• Number of 6 X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 1 0 vertically.at n=5A207491
• Number of nX5 0..3 arrays with every row least squares fitting to a positive slope straight line and every column least squares fitting to a zero or positive slope straight line, with a single point array taken as having zero slope.at n=1A223750
• T(n,k)=Number of nX(k+1) 0..3 arrays with every row least squares fitting to a positive slope straight line and every column least squares fitting to a zero or positive slope straight line, with a single point array taken as having zero slope.at n=11A223751
• Number of 2X(n+1) 0..3 arrays with every row least squares fitting to a positive slope straight line and every column least squares fitting to a zero or positive slope straight line, with a single point array taken as having zero slope.at n=3A223753
• Number of length n+4 0..5 arrays with every five consecutive terms having four times some element equal to the sum of the remaining four.at n=17A249653
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 505", based on the 5-celled von Neumann neighborhood.at n=31A272583
• Expansion of Product_{k>=1} (1 + x^k)^prime(k+1).at n=12A353169