3686401domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that sigma(p-1)+sigma(p+1) is prime.at n=32A067464Number of binary strings of length n with equal numbers of 00101 and 10101 substrings.at n=23A164249Primes of the form 2^(k-1)*k^2-(-1)^k.at n=11A216362Prime numbersat n=262480