31526

Appears in sequences

• Trajectory of 3 under map n->7n-1 if n odd, n->n/2 if n even.at n=36A063871
• Expansion of q^(-1/3) * eta(q^6)^2 / (eta(q) * eta(q^3)) in powers of q.at n=36A097197
• Irregular array where the n-th row are the divisors, not occurring earlier in the sequence, of the sum of the terms in all previous rows. a(1)=5.at n=37A120579
• Expansion of psi(-q^3) / f(q) where psi(), f() are Ramanujan theta functions.at n=36A139135
• a(n) = 81*n^2 - 44*n + 6.at n=20A156676
• Number of n X 3 1..2 arrays containing at least one of each value, and all equal values connected.at n=9A166761
• Number of n X 2 arrays of the minimum value of corresponding elements and their horizontal, vertical or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X 2 array.at n=25A219810
• a(n) = Sum_{1<=i<=j<=n} prime(i)*prime(j).at n=12A357251