55693

Appears in sequences

• Numbers n such that 289*2^n-1 is prime.at n=22A050903
• E.g.f.: exp( Sum_{n>=1} x^(n*(n+1)/2) / n! ).at n=9A226839
• a(n) = (n - 1)*(n - 2)*(5*n^4 + 3*n^3 + 34*n^2 - 264*n + 180)/360.at n=13A238108
• a(n) is the least number k such that the sum of n^2 consecutive primes starting at prime(k) is a square.at n=21A357813