24554

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 13.at n=19A031601
• a(n) = 2^n + 2^(n - 1) - n - 8.at n=11A058968
• a(n) is the least positive integer k such that g(k) = n*g(k-1), where g(k) = prime(k+1) - prime(k).at n=38A078563
• Numbers n such that n^16+1 and (n+2)^16+1 are both prime.at n=31A217991
• Numbers whose sum of anti-divisors is equal to the sum of the divisors of their arithmetic derivative.at n=24A249912
• Number of binary strings of length n that are powers of shorter strings, but cannot be written as the concatenation of two or more such strings.at n=44A265648
• a(0) = 1 and a(n) = A005169(n) - A005169(n-1).at n=22A289080
• Numbers k such that (44*10^k - 503)/9 is prime.at n=18A294127
• Position of second appearance of 2n in the sequence of prime gaps A001223; if 2n does not appear at least twice, a(n) = -1.at n=38A356221