26109

Appears in sequences

• Numbers k such that 7*2^k - 1 is prime.at n=11A001771
• Pisot sequence E(14,23), a(n) = floor( a(n-1)^2/a(n-2)+1/2 ).at n=15A010902
• Starting numbers for which the RATS sequence has eventual period 3.at n=7A114613
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, 1), (0, -1), (0, 1), (1, -1), (1, 1)}.at n=9A151459
• Number of pairs of terms of the sequence A228126 less than 10^n.at n=9A239290
• E.g.f.: (cosh(3*x) + sinh(3*x)*cosh(x)) / sqrt(1 - sinh(x)^2*sinh(3*x)^2).at n=6A245154