1492069domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that p+1, p+2, p+3, p+4 and p+5 have equal number of divisors.at n=17A119730Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11011-01110 pattern in any orientation.at n=20A147227Prime numbersat n=113608