27317

Appears in sequences

• a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 1.at n=41A025005
• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24.at n=61A051965
• Composite numbers not divisible by 5 which in base 5 contain their largest proper factor as a substring.at n=8A063889
• n*10^2-1, n*10^2-3, n*10^2-7 and n*10^2-9 are all prime.at n=32A064976
• Number of (n+1) X (5+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.at n=10A251146
• Number of nX6 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.at n=8A304261
• a(n) = Sum_{1 <= i <= j <= k <= m <= n} gcd(i,j,k,m).at n=25A344992
• Numbers m such that Stern polynomial B(m,x) has no irreducible polynomial factors that themselves are Stern polynomials. The initial a(1) = 1 is included by convention.at n=35A389918