86906

Appears in sequences

• Total number of parts in all partitions of n plus the sum of largest parts of all partitions of n.at n=29A211978
• Numbers k such that (10^k - 13)/3 is prime.at n=23A280017
• Triangle read by rows: T(n,m) (n >= m >= 1) = number of line segments formed by drawing the lines connecting any two of the 2*(m+n) perimeter points of an m X n grid of squares.at n=53A331454
• a(n) is the smallest number which can be represented as the sum of four distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists.at n=28A374274