28541

Properties

Appears in sequences

• Primes p from A031924 such that A052180(primepi(p)) = 17.at n=28A052234
• Primes of the form 2n^2+14n+5.at n=19A154577
• Numbers n with property that n^2 starts and ends with 81.at n=6A159775
• a(n)= least number k > a(n-1) such that k*(2^p-1)*(k*(2^p-1)+1)-1 is prime, where p = A000043(n) = Mersenne exponents.at n=25A200655
• The number of 2 X 2 symmetric positive definite matrices whose entries are integers x,y,z satisfying x^2 + y^2 + z^2 <= n^2.at n=38A219744
• Number of n X n 0..2 arrays with rows nondecreasing and antidiagonals unimodal.at n=4A224006
• Number of n X 4 0..2 arrays with rows nondecreasing and antidiagonals unimodal.at n=3A224008
• T(n,k)=Number of nXk 0..2 arrays with rows nondecreasing and antidiagonals unimodal.at n=24A224012
• Number of 4 X n 0..2 arrays with rows nondecreasing and antidiagonals unimodal.at n=3A224014
• Primes such that prime plus its digit sum is a perfect square.at n=13A230087
• Primes p such that p + digitsum(p) = q^k for some prime q and k > 1 where digitsum(n) = A007953(n).at n=5A242368
• Odd numbers n such that the sum of the binary digits of n and n^2 both equal 12.at n=36A261593
• Primes p such that p+2^3, p+2^5 and p+2^7 are all primes.at n=40A275475
• Prime numbers a(n) = floor(2^(n^d)) for all n>=1 where d=1.5039285240... is the constant defined at A339457.at n=5A339459
• Prime numbersat n=3104