43793

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 18.at n=17A031606
• Primes p whose period of reciprocal equals (p-1)/7.at n=34A056212
• Primes of the form 14*k^2 + 26*k + 13.at n=19A176617
• Primes p such that 2p+1, 3p+2 and 5p-2 are also primes.at n=34A178068
• Number of (n+1) X (n+1) -6..6 symmetric matrices with every 2 X 2 subblock having sum zero and one or two distinct values.at n=17A211253
• Table read by rows: list of prime 5-tuples of the form (p, p+2, p+6, p+8, p+12).at n=44A270998
• Table read by rows: list of prime sextuplets (p, p+4, p+6, p+10, p+12, p+16).at n=29A271000
• Number of nX6 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.at n=2A283782
• T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.at n=30A283784
• Number of 3Xn 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.at n=5A283786
• Prime p1 of consecutive primes p1, p2, where p2 - p1 = 8, and p1, p2 are in different centuries.at n=30A287049
• Number of faces in the n-polygon diagonal intersection graph.at n=30A301748
• a(n) is the least prime p such that the second forward difference of three consecutive primes p, q and r is n = (p - 2q + r)/2.at n=22A316791
• Beginning with 13, least prime such that concatenation of first n terms and its digit reversal both are primes.at n=30A382898
• Prime numbersat n=4563