19819

Properties

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 96 ones.at n=10A031864
• Numbers k such that 71*2^k+1 is prime.at n=20A032385
• Number of mono-4-polyhexes with n cells.at n=9A038392
• Same as A038392 except for initial term.at n=9A044045
• Primes p such that q-p = 22, where q is the next prime after p.at n=35A061779
• Primes p such that p + googol is prime.at n=14A108250
• Four-column table read by rows: number of nonisomorphic systems of catafusenes in an example (see Cyvin et al. (1994) for precise definition).at n=32A121178
• Primes congruent to 54 mod 59.at n=40A142781
• Primes congruent to 55 mod 61.at n=39A142853
• 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, 0, 0), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.at n=10A148375
• 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, 0), (-1, 0, 1), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.at n=8A149676
• K-bit primes p such that p-2^i and p+2^i are composite for 0<=i<=K-1.at n=10A153352
• Primes of the form XYX, where Y is a single digit.at n=26A154270
• Primes of the form abcabc..abcab.at n=11A228627
• Number of partitions of n that are separable by the least part; see Comments.at n=46A239515
• Odd numbers m that are neither of the form p + 2^k nor of the form p - 2^k with 2^k < m, k >= 1, and p prime.at n=25A255967
• Primes of the form 43*n^2 - 537*n + 2971 in order of increasing nonnegative values of n.at n=27A272285
• Number of nX5 0..1 arrays with every element unequal to 0, 1, 2, 4, 7 or 8 king-move adjacent elements, with upper left element zero.at n=5A316542
• Number of nX6 0..1 arrays with every element unequal to 0, 1, 2, 4, 7 or 8 king-move adjacent elements, with upper left element zero.at n=4A316543
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 4, 7 or 8 king-move adjacent elements, with upper left element zero.at n=49A316545