53241domain: NAppears in sequences2^(n-1) times coefficient of x in (1+x)^n mod U(n,x), U the Chebyshev polynomials.at n=12A099590Numbers m such that the sum of the first k odd primes = m-th odd prime.at n=34A179321Distinct-digit numbers that are the concatenation of m and prime(m) for some number m.at n=23A255729