20041

Appears in sequences

• Positive numbers k such that k and 2*k are anagrams in base 8 (written in base 8).at n=37A023073
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 96 ones.at n=12A031864
• a(n) = n*(13*n^2 - 7)/6.at n=21A062025
• Multiples of 7 whose sum of digits is equal to 7.at n=30A063416
• Number of incongruent ways to tile a 2 X n room with 1 X 2 Tatami mats. At most 3 Tatami mats may meet at a point.at n=27A068927
• Antidiagonal sums of the antidiagonals of Losanitsch's triangle.at n=29A102543
• Numbers such that the digital sum base 2 and the digital sum base 3 and the digital sum base 10 all are equal.at n=21A135120
• Number of n-bead necklaces labeled with numbers -2..2 not allowing reversal, with sum zero.at n=8A208591
• T(n,k) = number of n-bead necklaces labeled with numbers -k..k not allowing reversal, with sum zero.at n=53A208597
• Solution of the complementary equation a(n) = 2*a(n-1) - a(n-2) + b(n-1) + 2, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=44A294870
• Irregular table whose rows list the nontrivial cycles of the ghost iteration A329201, starting with the smallest member.at n=6A329342
• Expansion of e.g.f. 1/(2 - exp(3*x))^(1/3).at n=5A352118
• G.f. A(x) satisfies A(x) = 1/((1 - x*A(x)^2) * (1 - x*A(x))).at n=6A379209
• Number of integer partitions of n having no permutation with all equal run-lengths.at n=44A382915
• Numbers m such that Stern polynomial B(m,x) has no irreducible polynomial factors that themselves are Stern polynomials. The initial a(1) = 1 is included by convention.at n=26A389918