21551

Appears in sequences

• Every prefix prime in base 6 (written in base 6).at n=24A024766
• Odd numbers n for which 17 is the smallest i (>= 1) with Jacobi symbol J(i,n) getting either a value 0 or -1.at n=26A112077
• Agreement numbers: number of nX3 arrays of the count of horizontal and vertical neighbors equal to the corresponding element in a random 0..3 nX3 array.at n=3A220784
• Agreement numbers: number of nX4 arrays of the count of horizontal and vertical neighbors equal to the corresponding element in a random 0..3 nX4 array.at n=2A220785
• T(n,k)=Agreement numbers: number of nXk arrays of the count of horizontal and vertical neighbors equal to the corresponding element in a random 0..3 nXk array.at n=17A220786
• T(n,k)=Agreement numbers: number of nXk arrays of the count of horizontal and vertical neighbors equal to the corresponding element in a random 0..3 nXk array.at n=18A220786
• Denominators of the ordinary convergents of continued fraction [2/1,3/2,4/3,5/4,...].at n=9A229352
• Number of partitions p of n such that (number of numbers in p that have multiplicity 1) > (number of numbers in p having multiplicity > 1).at n=41A329976