20778

Appears in sequences

• Number of numbers removed in each step of Eratosthenes's sieve for 10^6.at n=4A145539
• Expansion of q^(3/8) * a(q) / eta(q^3)^3 in powers of q where a() is a cubic AGM function.at n=28A187429
• Numbers that match polynomials over {0,1} that have a factor containing -3 as a coefficient; see Comments.at n=32A208182
• Least positive integer k such that prime(k*n)^2 - 2 = prime(i*n)*prime(j*n) for some integers 0 < i < j.at n=47A260080
• a(n) is the Wiener index of a sling on n+1 vertices.at n=49A349417
• Expansion of 1/(Sum_{k>=0} x^(k^2))^3.at n=34A363775
• Total number of ways of partitioning n and any natural number less than or equal to n into the same number of parts, not treating partitions of n and itself in a different order as distinct.at n=16A380126