22921

Properties

Appears in sequences

• a(n) = 12*a(n-1) + 5*a(n-2) for n >= 2, a(0) = 0, a(1) = 1.at n=5A015610
• Primes p such that p+1 is palindromic.at n=35A028981
• Primes base 10 that remain primes in six bases b, 2<=b<=10, expansions interpreted as decimal numbers.at n=8A052028
• Least prime in A031934 (lesser of 16-twins) whose distance to the next 16-twin is 6*n.at n=34A052357
• Denominators of continued fraction convergents to (sqrt(37)-4)/3.at n=13A082975
• Total number of parts in all compositions of n into distinct odd parts.at n=46A097936
• Prime numbers p such that pi(p) + 2*p is a square.at n=19A104783
• Expansion of x * (x+1) * (x^3-x^2-1) / ((x^2+1) * (x^3+x^2-1)).at n=38A122519
• Primes p of Erdos-Selfridge class 5+ with largest prime factor of p+1 not of class 4+.at n=2A129473
• Primes p such that continued fraction of (1 + sqrt(p))/2 has period 15: primes in A146338.at n=32A146360
• a(n) = A168174(n)-10^12.at n=27A168248
• Primes that are the sum of three consecutive primes in A034962.at n=34A207527
• Smallest prime that can be expressed as the sum of n distinct positive squares with the largest square as small as possible.at n=38A224498
• Primes whose binary and ternary representations are also prime when read in decimal.at n=30A236537
• Number of (n+1) X (2+1) 0..1 arrays with each row and column not divisible by 3, read as a binary number with top and left being the most significant bits.at n=5A263054
• Number of (n+1)X(6+1) 0..1 arrays with each row and column not divisible by 3, read as a binary number with top and left being the most significant bits.at n=1A263058
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with each row and column not divisible by 3, read as a binary number with top and left being the most significant bits.at n=22A263060
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with each row and column not divisible by 3, read as a binary number with top and left being the most significant bits.at n=26A263060
• Hyperartiads.at n=22A270798
• Number of 2 X n 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.at n=13A281716