31657

Properties

Appears in sequences

• Numbers k such that 275*2^k + 1 is prime.at n=26A053354
• Class 7- primes.at n=12A081426
• Primes p such that if q is the next prime after p then the concatenation of p with q and the concatenation of q with p are both primes.at n=39A225575
• Primes p such that 2*p + 1 is abundant.at n=35A267476
• Start of record gaps between sums of two squares.at n=13A297350
• First occurrence of difference n between two consecutive terms of A000404. a(n) gives the lower term. The upper term is A355238.at n=23A355237
• Number of odd-length integer partitions of n whose parts do not have the same mean as median.at n=43A359896
• Prime numbersat n=3405