308575

Appears in sequences

• Number of positive integers <= 10^n that are divisible by no prime exceeding 7.at n=27A106600
• Solution of the complementary equation a(n) = a(n-1) + 2*a(n-2) + b(n-2), where a(0) = 1, a(1) = 2, b(0) = 3, b(1) = 4, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A295145