18478

Appears in sequences

• Pisot sequence P(7,11), a(0)=7, a(1)=11, a(n+1) is the nearest integer to a(n)^2/a(n-1). Agrees with A021014 only for n <= 20.at n=18A021013
• a(n)=a(n-1)+a(n-2)-a(n-4)+a(n-5).at n=18A021014
• Numbers whose least quadratic nonresidue (A020649) is 19.at n=6A025027
• Expansion of (1+sin(x)+sin(x)^2)/(1-sin(x)+sin(x)^2).at n=7A029589
• a(n) = (a(n-1)+a(n-2))/7^k, where 7^k is the highest power of 7 dividing a(n-1)+a(n-2).at n=41A078414
• a(n) = first term that can be reduced in n steps via repeated interpretation of a(n) as a base b+1 number where b is the largest digit of a(n), such that b is always 8 so that each interpretation is base 9. Terms already fully reduced (i.e., single digits) are excluded.at n=6A141842
• The path length of the Fibonacci tree of order n.at n=15A178523
• Number of distinct solutions of sum{i=1..10}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.at n=4A180781
• The least integer k >= 0 for which A328578(k) = A257993(A276086(A276086(k))) = n.at n=21A328761
• Numbers k such that k divides the sum of digits in primorial base of all numbers from 1 to k.at n=33A333703
• Numbers k such that A003415(k) == A276085(k) (mod 2310), where A003415 is the arithmetic derivative and A276085 is the primorial base log-function.at n=19A391864