23365

Appears in sequences

• Powers of fourth root of 5 rounded to nearest integer.at n=25A018058
• Powers of fourth root of 5 rounded up.at n=25A018059
• Numbers k such that the continued fraction for sqrt(k) has period 97.at n=12A020436
• Numbers having four 5's in base 8.at n=15A043444
• Numbers k such that 3*R_k - 2 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=25A055557
• Sequence whose Mobius transform leads to the first differences of the terms.at n=16A101172
• Minimal peaks in digital expansions of Pi: positions of peaks equal to 1.at n=24A105275
• Coefficient expansion of the characteristic polynomial of the {3,4,5} simplex matrix: M = {{0, 3, 0}, {0, 0, 4}, {1, 1, 1}}; p(x)=12 + 4 x + x^2 - x^3.at n=9A147834
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2 n steps taken from {(-1, 1), (1, -1), (1, 1)}.at n=7A151382
• Number of cyclotomic cosets of 7 mod 10^n.at n=18A220019
• Number of 3 X n 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=9A241437
• The 240-degree spoke (or ray) of a hexagonal spiral of Ulam.at n=44A244805
• Place n equally spaced points on each side of a square, and join each of these points by a chord to the 3*n new points on the other three sides: sequence gives number of vertices in the resulting planar graph.at n=8A367276
• Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of these n*k points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of vertices in the resulting planar graph.at n=46A367302
• a(n) = floor(b(n)), where b(1) = 1 and b(n) = b(n-1) + Sum_{k=1..n-1} b(k)/(n-1).at n=40A376995
• E.g.f. A(x) satisfies A(x) = exp(x*A(3*x)).at n=4A385526