66674

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 20.at n=18A031608
• Number of primitive (period n) step cyclic shifted sequence structures using a maximum of five different symbols.at n=12A056442
• Partial sums of A087100.at n=29A087098
• Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 7.at n=43A137094