54727

Properties

Appears in sequences

• Number of strings of numbers x(i=1..7) in 0..n with sum i^2*x(i)^2 equal to n^2*49.at n=21A184245
• Primes whose base-6 representation also is the base-3 representation of a prime.at n=27A235469
• Number of (n+1) X (1+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge or main diagonally.at n=10A251285
• Numbers k such that R_(k+2) + 7*10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=12A256933
• a(n) = 2*a(n-1) - a(n-3) for n >= 5, a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 12, a(4) = 22.at n=20A289107
• a(n) is the first prime p such that the sum of 2*n consecutive primes starting at p is q*(q+1) where q is prime, or 0 if there is no such p.at n=14A338989
• Positive integers k such that the decimal representation of 2^k ends with some permutation of the string "0123456789".at n=14A347164
• Prime numbersat n=5569