105441

Appears in sequences

• exp(arctan(arctanh(x)))=1+x+1/2!*x^2+1/3!*x^3+1/4!*x^4+9/5!*x^5...at n=10A012231
• cosh(arctan(arctanh(x)))=1+1/2!*x^2+1/4!*x^4+49/6!*x^6+1345/8!*x^8...at n=5A012238
• Smallest number that yields a prime when concatenated with A088265(k) for all k <= n.at n=6A088266
• Smallest number that yields a prime when concatenated with A088265(k) for all k <= n.at n=7A088266
• Expansion of 1/sqrt(1 - 2*x - 63*x^2).at n=6A098441
• G.f.: (21+104*x+103*x^2+23*x^3+x^4)/(1-x)^5.at n=9A160787
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of 1/sqrt(1 - 2*x + (1-4*k^2)*x^2).at n=61A307847