20233

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of function f(x) = 9x + 4.at n=39A023297
• Numbers n > 9 such that x^n + x^9 + x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x +1 is irreducible over GF(2).at n=25A057487
• a(n) = Sum_{k=0..floor(n/6)} C(n-3k,3k) * 3^k * 2^(n-6k).at n=12A100139
• Indices of primes in sequence defined by A(0) = 49, A(n) = 10*A(n-1) - 71 for n > 0.at n=7A101718
• Primes congruent to 55 mod 59.at n=40A142782
• Primes congruent to 42 mod 61.at n=36A142840
• Least Ramanujan prime having a gap of 2n to the next Ramanujan prime.at n=46A182874
• Primes that remain prime when a single digit 9 is inserted between any two consecutive digits or as the leading or trailing digit.at n=23A215421
• Prime(n) such that prime(3n) - prime(2n) - prime(n) is a perfect cube.at n=11A224863
• Primes whose digits add to 10 and which have a 3 in the tens place.at n=10A227825
• Intersection of A013917 and A071150.at n=13A255017
• Primes p such that each decimal digit of p is equal to the difference of two other digits of p.at n=12A255892
• Non-palindromic balanced primes in base 16.at n=22A256090
• Primes having only {0, 2, 3} as digits.at n=12A260125
• Twin primes both of which are the sum of three positive cubes.at n=15A272376
• Prime numbers p such that 0 < pi(p;10,(9,1)) = pi(p;10,(3,9)) where pi(x;q,(a,b)) is the number of primes p_n <= x such that p_n == a (mod q) and p_(n+1) == b (mod q).at n=43A326897
• Primes that are equal to the sum of the first k proper prime powers for some k.at n=5A368850
• a(n) is the least prime p such that n^2 + (p-n)^2 is prime and k^2 + (p-k)^2 is composite for 1 <= k < n.at n=43A376920
• Primes having only {0, 2, 3, 4} as digits.at n=22A386041
• Primes having only {0, 2, 3, 5} as digits.at n=28A386042