26707

Appears in sequences

• a(n) is the smallest semiprime such that difference between a(n) and next semiprime, b(n), is n.at n=26A131109
• a(n) = least member of A006881 whose difference from the following one equals n, or 0 if no such semiprime exists.at n=26A140784
• Triangle, read by rows, equal to the matrix square of triangle A185620.at n=49A185624
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2<x^2+y^2.at n=33A211635
• Number of positive solutions to (x_1)^2 + (x_2)^2 + (x_3)^2 + (x_4)^2 <= n^2.at n=16A341423
• Semiprimes k such that k is congruent to 7 modulo k's index in the sequence of semiprimes.at n=4A356357
• a(n) is the constant term in expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^3.at n=4A369372