488651domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest weak prime in base n.at n=27A186995Number of arrays of 5 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero.at n=28A201813Smallest weak prime in base 2n+1.at n=13A371475Prime numbersat n=40662