26878

Appears in sequences

• Numbers whose base-5 representation contains exactly three 0's and three 3's.at n=26A045202
• a(n) = a(n-1) + a(n-4); first four terms are 0,1,2,3.at n=32A078467
• Numbers k such that k and k^2 use only the digits 2, 4, 6, 7 and 8.at n=24A137101
• a(n) is equal to the rational part (considering of the field Q(sqrt(13))) of the numbers A(n)/sqrt(13), where we have A(n) = ((sqrt(13) - 1)/2)*A(n-1) + A(n-2) + ((3-sqrt(13))/2)*A(n-3), with A(0) = 6, A(1) = sqrt(13) - 1, and A(2) = 11 - sqrt(13).at n=17A216486
• Number of equivalence classes of compositions of n where two compositions a,b are considered equivalent if the summands of a can be permuted into the summands of b with an even number of transpositions.at n=38A218004
• 4-step Fibonacci sequence starting with 1,1,0,0.at n=19A251703
• Numbers n such that the decimal expansions of both n and n^2 have 2 as smallest digit and 8 as largest digit.at n=41A257368