26001

Appears in sequences

• Number of singular 2 X 2 matrices over Z(n) (i.e., with determinant = 0).at n=26A020478
• Odd 10-gonal (or decagonal) numbers.at n=40A028993
• Numerators of continued fraction convergents to sqrt(687).at n=7A042320
• Values of x in positive integer solutions of x^2 + y^5 = z^3, listed in increasing order of z. (If a z-value occurs twice, list solutions in increasing order of y.)at n=10A070065
• a(n) = 4*n^4 - 3*n^2.at n=8A079414
• Numerators of Newton-Cotes formulas.at n=48A093735
• Numerators of Newton-Cotes formulas.at n=49A093735
• 10-gonal numbers which are divisible by the sum of their digits.at n=28A119548
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 0), (-1, 1, 1), (0, 1, 1), (1, 0, -1)}.at n=10A148450
• Triangle of z Transform coefficients from General Pascal [1,8,1} A142458 polynomials multiplied by factor 3^Floor[(2*k - 1)/3].at n=38A167786
• a(n) = 3^(floor(n/2))+3^(floor(n/2)-1)-3^(floor((n-1)/3)).at n=16A170832
• a(n) = 3*a(n-1)+3*a(n-2) with a(0)=1 and a(1)=2.at n=8A202206
• a(n) = (1/n) * A205454(n).at n=31A205455
• A239461(n) / n^2.at n=25A239464
• Number of non-congruent solutions of x^2 + y^2 + z^2 + t^2 == 0 mod n.at n=26A240547
• Numbers n such that A000203(2*n) divides 2*n*A045917(n).at n=19A245629
• Number of balanced ternary words of length n.at n=29A260938
• Expansion of 1/(-x*sqrt(4*x^2+1)-x^2+1).at n=16A271318
• The number of n X k matrices, k=0..n, with nonnegative integer entries and every row and column sum <=3 . Triangle T(n>=0, 0<=k<=n) read by rows.at n=38A301390
• Number of non-congruent solutions of x^2+y^2 == z^2+w^2 (mod n).at n=26A316148