23059

Properties

Appears in sequences

• Primes p such that x^27 = 2 has no solution mod p, but x^9 = 2 has a solution mod p.at n=8A059354
• Primes p such that x^9 = 2 has a solution mod p, but x^(9^2) = 2 has no solution mod p.at n=9A070185
• a(0)=0, a(1)=1, a(2)=1, a(3)=1, a(n) = a(n-3) + a(n-4) for n > 3.at n=53A079398
• Least number beginning with n such that every concatenation is a prime.at n=22A090506
• Primes congruent to 49 mod 59.at n=38A142776
• Primes p such that the multiplicative order of 2 modulo p is (p-1)/9.at n=15A152309
• Primes p such that all the digits needed to write the consecutive Primes from 2 to p fill exactly a square (no holes, no overlaps).at n=28A158024
• Primes p such that 4*p and 6*p are each the sum of two consecutive primes.at n=34A164133
• Primes p such that p*floor(p/2)-2 and p*floor(p/2)+2 are also prime numbers.at n=28A164621
• Primes of the form 13*n^2+3*n+1.at n=21A176783
• Prime numbers 3*n-2 such that n, 2*n-1 and 3*n-2 are prime.at n=35A180025
• Primes of the form 6*k^2 - 5.at n=17A201791
• Number of n X 3 0..2 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1) X 4 0..2 array without adjacent equal elements in the latter.at n=4A229516
• Number of n X 5 0..2 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1) X 6 0..2 array without adjacent equal elements in the latter.at n=2A229518
• T(n,k) = number of n X k 0..2 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1) X (k+1) 0..2 array without adjacent equal elements in the latter.at n=23A229521
• T(n,k) = number of n X k 0..2 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1) X (k+1) 0..2 array without adjacent equal elements in the latter.at n=25A229521
• Smallest positive integer solution x of (3^3)*x - 2^n*y = 1 for n >= 0.at n=15A239125
• Greater of twin primes of (40n-23,40n-21).at n=31A244505
• Primes p such that p^3 is the concatenation of two k-digit primes where k is half the number of decimal digits in p^3.at n=9A248208
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 593", based on the 5-celled von Neumann neighborhood.at n=28A273121