81700

Appears in sequences

• Number of distinct Cunningham chains of first kind whose initial prime (cf. A059453) <= 2^n.at n=23A059690
• a(n) = binomial(n,4) - binomial(floor(n/2),4) - binomial(ceiling(n/2),4).at n=40A111385
• Sum of the parts in the partitions of 4n into 4 parts with smallest part = 1.at n=24A239056