38975

Appears in sequences

• Number of Poulet numbers (or pseudoprimes to base 2, A001567) less than 10^n.at n=10A055550
• Eigensequence of A053121.at n=13A130018
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n), where a(0) = 2, a(1) = 3, b(0) = 1, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=18A295951