1453336885domain: NAppears in sequencesOdd squarefree n not divisible by 3 such that n/phi(n) > 2, where phi is Euler's totient function.at n=7A215130a(n) = denominator of T(n, 2) with T(n, m) = Sum_{k=0..n}( 1/(m*k+1) * Sum_{j=0..m*k} (-1)^j*C(k,j)*j^(m*n) ).at n=24A273197Column 0 of the irregular triangle A355588.at n=32A355952