20190

Appears in sequences

• McKay-Thompson series of class 21D for Monster.at n=25A058566
• Triangle, read by rows, where T(n,k) is the coefficient of q^(nk+k) in the squared q-factorial of n+1.at n=22A129274
• Triangle, read by rows, where T(n,k) is the coefficient of q^(nk+k) in the squared q-factorial of n+1.at n=26A129274
• Column 1 of triangle A129274; a(n) is the coefficient of q^(n+2) in the squared q-factorial of n+2.at n=5A129275
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}.at n=8A150307
• Record (maximal) gaps between prime triples (p, p+2, p+6).at n=32A201598
• McKay-Thompson series of class 21D for the Monster group with a(0) = 2.at n=25A226015
• Numbers equidistant from twin prime pairs that are also equidistant from numbers equidistant from twin prime pairs.at n=24A260517
• Number of integers in n-th generation of tree T(-3/4) defined in Comments.at n=44A274151
• Numbers k such that (22*10^k + 161)/3 is prime.at n=22A282278
• G.f.: Im((2*i; x)_oo), where (a; q)_oo is the q-Pochhammer symbol, i = sqrt(-1).at n=41A292140
• Numbers k such that Bernoulli number B_{k} has denominator 14322.at n=28A295588
• G.f.: Sum_{k>=0} A000009(k)^2 * x^k / Sum_{k>=0} A000041(k) * x^k.at n=50A305350