28559

Properties

Appears in sequences

• Let A(n) = #{(i,j): i^2 + j^2 <= n}, V(n) = Pi*n, P(n) = A(n) - V(n); sequence gives values of n where |P(n)| sets a new record.at n=44A000099
• Primes of the form k^2 - 2.at n=38A028871
• Primes p of form q^k-2 where q is also a prime and k > 1.at n=25A053705
• Smallest prime p such that n is a solution mod p of x^4 = 2, or 0 if no such prime exists.at n=11A065902
• Frobenius number of the numerical semigroup generated by 3 consecutive triangular numbers.at n=31A069755
• Values of n such that len_x(n) = 0 in A090822.at n=14A091410
• Lengths of the B blocks in analysis of A090822.at n=13A091411
• Primes p such that 2*p+1 and ((2*p+1)^2 + 1)/2 = p^2 + (p+1)^2 are primes.at n=31A098717
• Primes of the form 2*n^2 + 2*n - 1.at n=39A098828
• Prime Friedman numbers.at n=19A112419
• Smallest prime p such that p == 1 (mod prime(n)) and not p == 1 (mod k) for 2 < k < prime(n).at n=28A116605
• a(1) = 2; a(n) is greatest prime < a(n-1)^4.at n=2A118912
• a(n) = 2*a(n-1) - a(n-2) - a(n-4).at n=27A131041
• Positions of 11's in A131744.at n=12A133152
• Primes p such that the left prime neighbors p1, p2 of p as well as the right prime neighbors q1, q2 of p form twin prime pairs and the sum p1 + p2 + p + q1 + q2 is also prime.at n=22A138396
• Primes of the form : (p-n)/(n+1)=prime and (n+1)*p+n=prime. n=4.at n=36A152294
• Mix A091411 and its differences.at n=26A157217
• Numbers n with property that n^2 starts and ends with 81.at n=7A159775
• Primes of the form (p^2 - 3)/2 where p is also prime.at n=25A165635
• Primes p such that sum of divisors of p+2 is prime.at n=8A171130