31079

Properties

Appears in sequences

• Number of ordered 5-tuples of integers from [ 2,n ] with no common factors among triples.at n=23A015657
• Smaller of twin primes whose middle term is a multiple of A002110(4)=210.at n=25A060230
• Primes whose 10's complement is a cube.at n=6A083018
• Let n range through the odd numbers skipping multiples of 5; a(n) = n-th prime ending in n.at n=31A089779
• Index of first occurrence of n-th prime in A001203, the continued fraction for Pi.at n=34A107892
• Prime sequence overlaying the central digits of prime numbers. If possible, the value is greater than the previous one. Zero if no such embedding is possible.at n=27A133781
• Depression-type primes with five digits; from left to right digits decrease to and increase from the central digit.at n=11A157083
• Primes p such that 3*p+2, 5*p+4 and 7*p+6 are also prime.at n=32A173876
• List of primes p1 such that (p1,p2) are twin primes where both 2*p1+p2 and p1+2*p2 are primes.at n=13A174920
• a(n) = 2*n*(n+1)*(n+2)/3 + (-1)^n.at n=35A179783
• The prime(n)-th prime number ending in prime(n), or 0 if none exists.at n=21A238331
• Number of (n+2)X(2+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=10A252955
• Iterative procedure in A316941 applied to the odd composite numbers (A071904) (a(n) = -1 if no prime is ever reached).at n=9A276662
• Iterative procedure in A316941 applied to the odd composite numbers (A071904) (a(n) = -1 if no prime is ever reached).at n=17A276662
• Number of nX5 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=5A305646
• Number of nX6 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=4A305647
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=49A305649
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=50A305649
• The natural numbers sequence where every composite is replaced by a prime, according to the rule explained in the Comments section (a(n) = -1 if no such prime is reached).at n=48A316941
• Number of connected components of polyhedra in the quarter cubic honeycomb up to translation, rotation, and reflection of the honeycomb.at n=8A384274