20016

Appears in sequences

• Expansion of (theta_3(z)*theta_3(15z) + theta_2(z)*theta_2(15z))^4.at n=24A028628
• McKay-Thompson series of class 24I for Monster.at n=29A058579
• Number of divisors of n! which are also differences between consecutive divisors of n! (ordered by size).at n=21A060742
• Numbers k such that the number of steps to reach 1 in '3x+1' problem equals tau(k), the number of divisors of k.at n=29A070980
• Sizes of successive increasing gaps between 3-smooth numbers.at n=40A084788
• Numbers k such that R_k + 2 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=12A097683
• Structured truncated cubic numbers.at n=15A100152
• McKay-Thompson series of class 24I for the Monster group with a(0) = 2.at n=29A138688
• 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, 1), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.at n=8A150169
• Partial sums of naughty primes A164968.at n=1A173029
• Partial sums of floor(7^n/8)/6.at n=6A178730
• Triangle of coefficients of polynomials u(n,x) jointly generated with A209134; see the Formula section.at n=51A209133
• Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths incorporating each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 4, n >= 2.at n=37A214510
• Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths incorporating each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 8, n >= 2.at n=19A214605
• Number of nX3 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=3A223190
• Number of nX4 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=2A223191
• T(n,k)=Number of nXk 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=17A223195
• T(n,k)=Number of nXk 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=18A223195
• Product between n-th prime and next perfect square.at n=33A229497
• Table of coefficients in the iterations of Euler's tree function (A000169), as read by antidiagonals.at n=81A274390