60470

Appears in sequences

• a(n) = |{m : multiplicative order of 9 mod m = n}|.at n=41A059891
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n*b(n-2), where a(0) = 1, a(1) = 2, b(0) = 4, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A296285