825259domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) is the number of n-tosses having a run of 3 or more heads for a fair coin (i.e., probability is a(n)/2^n).at n=19A050231Primes p such that p^2 +- 12 and p^2 +- 18 are also primes.at n=26A153121a(n) = Sum_{d|n} (n/d)^(n/d) * binomial(d+n-1,n).at n=6A343568Prime numbersat n=65818