87971

Appears in sequences

• Coefficients in a q-analog of the function LambertW(-2*x)/(-2*x), as a triangle read by rows.at n=36A152555
• Expansion of 1/(1 - Sum_{k>=2} mu(k)^2*x^k), where mu(k) is the Moebius function (A008683).at n=30A280197
• Indices of Ulam prime triples, where u(k), u(k+1) and u(k+2) are all primes, and u(k) = A002858(k) are the Ulam numbers.at n=29A307330
• Absolute discriminants of imaginary quadratic number fields with elementary bicyclic 5-class group (5,5).at n=29A359871