72923

Properties

Appears in sequences

• Start with x, xy; then concatenate each word in turn with all preceding words, getting x xy xxy xxxy xyxxy xxxxy xyxxxy xxyxxxy ...; sequence gives number of words of length n. Also binary trees by degree: x (x,y) (x,(x,y)) (x,(x,(x,y))) ((x,y),(x,(x,y)))...at n=19A063895
• Table(n,j) of primes p = k*prime(n)#/210-j, where k is the least integer such that p and p+8 are consecutive primes, for n > 4 and j=7 to 1.at n=14A098078
• Primes p such that the largest prime factor of p^5 + 1 is less than p.at n=22A102327
• Pierce expansion of the cube root of 1/2.at n=12A140076
• Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly two king-move neighbors, without consecutive collinear links.at n=3A220715
• T(n,k)=Number of ways to reciprocally link elements of an nXk array either to themselves or to exactly two king-move neighbors, without consecutive collinear links.at n=24A220718
• Smallest of three consecutive primes whose sum is a triangular number.at n=15A226148
• Prime numbersat n=7210