26214

Appears in sequences

• Number of n-bead necklaces with beads of 2 colors and primitive period n, when turning over is not allowed but the two colors can be interchanged.at n=20A000048
• Octahedral numbers: a(n) = n*(2*n^2 + 1)/3.at n=34A005900
• a(n) = floor(2^(n-1)/n).at n=19A006788
• Expansion of 1/((1-2*x)*(1+x^2)).at n=15A007910
• Least k such that first k terms of A022300 contain n more 2's than 1's.at n=27A025515
• Base 4 digits are, in order, the first n terms of the periodic sequence with initial period 1,2.at n=8A037481
• Numbers whose base-4 representation contains exactly four 1's and four 2's.at n=20A045109
• a(n) in base 16 is a repdigit.at n=51A048340
• Number of binary vectors (x_1,...x_n) satisfying Sum_{i=1..n} i*x_i = 3 (mod n+1) = size of Varshamov-Tenengolts code VT_3(n).at n=19A054200
• Nearest integer to 2^(n-1)/n.at n=19A054650
• Number of monic irreducible polynomials over GF(4) of degree n with fixed nonzero trace.at n=9A054660
• Number of primitive (period n) n-bead necklace structures using exactly two different colored beads.at n=19A056303
• a(n) is the position of A050614(n) in A062877.at n=14A062878
• Solutions to phi(gpf(x)) - gpf(phi(x)) = 254 = c are special multiples of 257, x = 257k, where largest prime factors of factor k were observed from {2, 3, 5, 17}. See solutions to other even cases of c (=A070813): A007283 for 0, A070004 for 2, A070814 for 14, A070816 for 65534.at n=26A070815
• Duplicate of A006788.at n=19A074099
• List of codewords in binary lexicode with Hamming distance 7 written as decimal numbers.at n=27A075937
• List of codewords in binary lexicode with Hamming distance 8 written as decimal numbers.at n=12A075940
• Expansion of 1/((1-x)*(1-2*x)*(1+x^2)).at n=14A077854
• Expansion of (1-x)/(1-x+2*x^3).at n=33A078014
• Expansion of (1-x)/(1-x+2*x^3).at n=31A078014