43506domain: NAppears in sequencesSubdiagonal of array of n-gonal numbers A081422.at n=35A081423Number of primes less than 10^n having at least one digit 7.at n=5A091708Number of n-bead necklaces labeled with numbers -1..1 not allowing reversal, with sum zero and first and second differences in -1..1.at n=25A209000