31393

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of function f(x) = 5x + 2.at n=28A023283
• Lower prime of a record difference between it and the second prime after it.at n=17A031133
• Primes in which the digit string can be partitioned into three parts such that third (least significant) part is the product of the first two.at n=21A088294
• Primes arising in A090266.at n=33A090267
• Smallest prime obtained by sandwiching prime(n) between identical digits, except that a(5) = 0.at n=33A090268
• Prime numbers that are the sum of three distinct positive fourth powers.at n=27A126657
• Let N(p,i) denote the result of applying "nextprime" i times to p; a(n) = smallest prime p such that N(p,2) - p = 2*n, or -1 if no such prime exists.at n=37A144103
• Primes with exactly three 3's.at n=33A178552
• Smallest emirp corresponding to the prime of A178581.at n=32A178582
• Smallest emirp corresponding to the prime of A178583.at n=11A178584
• Primes of the form (2*k^3 + 3*k^2 + k - 12)/6.at n=13A178608
• Number of 2 X 2 matrices having all terms in {1,...,n} and determinant = 0 (mod 3).at n=16A210698
• Five-digit primes whose first, third, and fifth digits are the same.at n=29A269066
• Iterative procedure in A316941 applied to the odd composite numbers (A071904) (a(n) = -1 if no prime is ever reached).at n=29A276662
• Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=11A316689
• 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=34A316791
• Let N(p,i) denote the result of applying "nextprime" i times to p; a(n) = smallest prime p such that N(p,3) - p = 2*n, or -1 if no such prime exists.at n=41A339943
• Primes where every other digit is 3 starting with the rightmost digit, and no other digit is 3.at n=31A348559
• The number of vertices in a Farey diagram of order (n,n).at n=6A358883
• Prime numbersat n=3384