27420

Appears in sequences

• Number of spanning trees with degrees 1 and 3 in C_5 X P_2n.at n=2A003734
• Numbers that are sums of 2 or more consecutive squares in more than 1 way.at n=35A062681
• When expressed in base 2 and then interpreted in base 3, is a multiple of the original number.at n=27A062845
• Triangle T, read by rows, where the g.f. of row n of T^n = (n^2 + y)^n for 0 <= n <= 29, where T^n denotes the n-th power of T considered as (lower-left) matrix.at n=24A132870
• Row sums of triangle A143102.at n=42A143103
• Triangle read by rows: number of topologies of n nested circles intersecting at most as triples, according to number of factors.at n=37A281350
• Numbers that can be written as the sum of four or more consecutive squares in more than one way.at n=26A307937
• Numbers k such that one of k-A001414(k) and k+A001414(k) is a prime and the other is the square of a prime.at n=12A358002