17992

Appears in sequences

• Pisot sequence L(5,8).at n=15A020736
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 67.at n=27A031565
• Expansion of (2-x-x^2-x^3)/((1-x)*(1-x^2-x^3)).at n=38A052954
• The array of A059578 read by antidiagonals in the 'up' direction.at n=40A059579
• Main diagonal of the array A059579.at n=4A059580
• Number of digits in A068943.at n=9A068946
• Expansion of (1-x)^(-1)/(1-x^2+x^3).at n=40A077883
• Convolution of natural numbers >= 2 and the partition numbers (A000041).at n=21A082775
• Binomial transform of double factorials.at n=6A084262
• a(n)=the sum of the (1,2)- and (1,3)-entries of the matrix P^n + T^n, where the 3 X 3 matrices P and T are defined by P=[0,1,0;0,0,1;1,0,0] and T=[0,1,0;0,0,1;1,1,0].at n=37A109524
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 1, -1), (0, 0, 1), (1, 0, 1)}.at n=9A149861
• A156977/3.at n=23A164565
• Number of nX3 0..2 arrays with no element equal the average of immediate neighbors vertically above and horizontally left of it.at n=3A208440
• Number of nX4 0..2 arrays with no element equal the average of immediate neighbors vertically above and horizontally left of it.at n=2A208441
• T(n,k)=Number of nXk 0..2 arrays with no element equal the average of immediate neighbors vertically above and horizontally left of it.at n=17A208445
• T(n,k)=Number of nXk 0..2 arrays with no element equal the average of immediate neighbors vertically above and horizontally left of it.at n=18A208445
• Index of the n-th 9 in the first occurrence of a string of exactly n 9's in the decimal expansion of Pi.at n=3A256160
• Sum of the prime parts in the partitions of n into 5 parts.at n=41A309466
• Sum of every third term of the Padovan sequence A000931.at n=13A329244
• Numbers that are the sum of four third powers in six or more ways.at n=14A345148