27406

Appears in sequences

• a(n) = (2*n+1)*(11*n+1).at n=35A033575
• Numerators of continued fraction convergents to sqrt(827).at n=6A042596
• Indices of prime numbers in A014258.at n=30A101760
• Numbers k such that lcm(1,2,3,...,k)/13 equals the denominator of the k-th harmonic number H(k).at n=32A112818
• a(n) = 1 + (6 + (11 + (6 + n)*n)*n)*n/24.at n=27A145126
• Number of (n+1)X(2+1) 0..2 arrays colored with the maximum plus the upper median minus the lower median of every 2X2 subblock.at n=2A236706
• Number of (n+1)X(3+1) 0..2 arrays colored with the maximum plus the upper median minus the lower median of every 2X2 subblock.at n=1A236707
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays colored with the maximum plus the upper median minus the lower median of every 2X2 subblock.at n=7A236710
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays colored with the maximum plus the upper median minus the lower median of every 2X2 subblock.at n=8A236710
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 345", based on the 5-celled von Neumann neighborhood.at n=34A271295
• a(n)^2 is the end of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245).at n=45A340664