77717

Appears in sequences

• Numbers having four 7's in base 10.at n=22A043520
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-1111 pattern in any orientation.at n=15A146656
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-2)*b(n-1), where a(0) = 1, a(1) = 4, b(0) = 2, b(1) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A296262
• Number of compositions (ordered partitions) of n into triangular parts (A000217) such that no two adjacent parts are equal (Carlitz compositions).at n=46A301502