134669domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that 42*p-1, 42*p+1 and 48*p-1, 48*p+1 are twin primes.at n=25A138697The nearest integer of perimeter of T-square (fractal) after n-iterations, starting with a unit square.at n=24A227621Prime numbersat n=12550