20509

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of function f(x) = 5*x + 6.at n=8A023315
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 86 ones.at n=24A031854
• Primes p such that p, p+12, p+24 are consecutive primes.at n=19A052188
• Upper twin primes of upper twin prime index.at n=20A088463
• Primes p of the form 2*prime(k) + 3 such that 2*prime(k+1) + 3 is the next prime after p.at n=40A089528
• Primes in A051022.at n=35A092908
• G.f.: 1/(1 - x^3 - 2 x^4 + x^5).at n=43A122517
• Primes congruent to 36 mod 59.at n=37A142763
• Primes p such that 2*p^3-+15 are also prime.at n=26A174364
• Positive integers n such that prime(n+i) is a primitive root modulo prime(n+j) for any distinct i and j among 0, 1, 2, 3.at n=3A243839
• Number of n X 4 nonnegative integer arrays with upper left 0 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.at n=9A252832
• Numbers n such that (n-2,n) are twin primes, and (n,n+2) are twin lucky numbers.at n=40A289123
• Primes whose decimal expansion is of the form d_1+0+d_2+0+d_3+0+...+0+d_k where d_i are digits with 1 <= d_i <= 9, k > 1 and + stands for concatenation.at n=29A309488
• Position of the first occurrence of n in A337474.at n=33A337476
• Twin primes p such that the absolute difference of p and the reverse of its twin is a twin prime.at n=32A342216
• a(n) is the number of positive integers k for which Sum_{i=1..j} (p_i+e_i) = n, where p_1^e_1*...*p_j^e_j is the prime factorization of k.at n=42A382330
• Primes having only {0, 2, 5, 9} as digits.at n=21A386050
• Prime numbersat n=2315