136951domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+1) X 5 0..2 matrices with each 2 X 2 subblock idempotent.at n=17A224672Primes p such that q^2 - p^2 + 1 is the square of a composite number where p and q are consecutive primes.at n=61A316934Prime numbersat n=12754