27617

Properties

Appears in sequences

• a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 1.at n=42A050043
• Primes of the form x^2 + (x+3)^2.at n=26A076727
• Minimum prime that raised to the powers from 1 to n produces numbers whose sums of digits are also primes.at n=6A131748
• Primes A080478(n)^2 + A080478(n+1)^2.at n=19A139361
• There appear to be at least n primes in the range (x-2*sqrt(x), x] for all x >= a(n).at n=25A189027
• Number of (2+1) X (n+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with values 0..2 introduced in row major order.at n=9A231264
• Numbers k such that R(k) - 10^floor(k/2-1) is prime, where R(k) = (10^k-1)/9 (repunit: A002275).at n=10A331863
• Primes in A373801 in order of their appearance.at n=26A373802
• Beginning with 7, least prime such that concatenation of first n terms and its digit reversal both are primes.at n=16A379761
• Prime numbersat n=3014