28666

Appears in sequences

• Number of n-step self-avoiding walks on hexagonal lattice from (0,0) to (2,2).at n=6A005553
• a(n) = 7*2^n - 6.at n=12A048489
• Numbers k such that 2*5^k - 3 is prime.at n=20A057915
• G.f.: (1+3*x+2*x^2)/((1-x)*(1-2*x^2)).at n=24A063757
• Number of 1's in binary expansion of parts in all partitions of n.at n=26A066624
• Potential magic constants of a 10 X 10 magic square composed of consecutive primes.at n=37A192087
• Constant term of the reduction by x^2 -> x+1 of the polynomial p(n,x) defined below in Comments.at n=13A192426
• Expansion of (1+4*x+5*x^2-x^3)/((1-x)*(1+x)*(1-2*x^2)).at n=24A220753
• Main diagonal of square arrays A114881 and A249741.at n=28A249743
• Number of cryptarithms of the form x + y = z in base n for which no summand contains any letter more than once and which have at least one solution.at n=3A277497
• Number of n X 3 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.at n=21A281710
• a(n) = a(n-1) + 2*a(n-4) - 2*a(n-5) for n >= 5, where a(0) = 2, a(1) = 4, a(2) = 6, a(3) = 8, a(4) = 10.at n=47A288732
• Values of n such that prime(n) does not divide any 10-digit pandigital number (i.e. any value in A050278).at n=7A292703
• Centered heptagonal numbers which are sphenic numbers.at n=10A360183