20887

Properties

Appears in sequences

• Numbers that are the sum of 5 positive 7th powers.at n=31A003372
• Primes that remain prime through 3 iterations of function f(x) = 2x + 3.at n=30A023273
• Numbers whose base-12 representation has exactly 5 runs.at n=6A043654
• a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 3.at n=17A049895
• Numbers k such that prime(k) + prime(k+1) + prime(k+2) is a square.at n=24A076305
• Primes p giving prime quadruples (30p+11, 30p+13, 30p+17, 30p+19).at n=13A087771
• Numbers n such that 30*n+7, 30*n+11, 30*n+13, 30*n+17, 30*n+19 are consecutive primes.at n=24A089157
• Primes of the form 6*k^2 + 1.at n=17A090687
• If p(k) is the k-th prime, then the n-th set of 3 consecutive cousin prime pairs starts at p(a(n)).at n=32A095970
• Primes p such that p+p^2+p^3-+2 are also prime.at n=34A154821
• Numbers n such that 30n-13, 30n-11, 30n-1, 30n+1, 30n+11, 30n+13 are all prime.at n=13A175683
• Number of primes of the form x^8 + 1 less than 10^n.at n=47A214454
• Primes congruent to 1 mod 59.at n=39A216315
• Alternating square row sums of the table A072233 (A008284).at n=32A238313
• Numbers n such that prime(n) contains a substring of all the prime digits in order, i.e., "2357".at n=8A295708
• Primes having only {0, 2, 7, 8} as digits.at n=28A386053
• Prime numbersat n=2349