31069

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 87.at n=21A020426
• Primes followed by a [10,2,10] prime difference pattern of A001223.at n=30A052376
• Depression-type primes with five digits; from left to right digits decrease to and increase from the central digit.at n=10A157083
• Smallest emirp corresponding to A178585.at n=30A178586
• Cyclops emirps.at n=35A183057
• Number of 7-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first and second differences in -n..n.at n=7A209011
• P(n,k) is an array read by rows, with n > 0 and k=1..5, where row n gives the chain of 5 consecutive primes {p(i), p(i+1), p(i+2), p(i+3), p(i+4)} having the symmetrical property p(i) + p(i+4) = p(i+1) + p(i+3) = 2*p(i+2) for some index i.at n=24A267028
• Numbers that are the smallest of four consecutive primes, no three of which sum to a nonprime.at n=12A298763
• Emirp-indexed emirps: emirps with emirp subscripts.at n=28A326442
• Prime numbersat n=3347