25889

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 18.at n=13A031606
• Sequence of 3 Pythagorean triangles, each with a leg and hypotenuse prime. The hypotenuse of each triangle is the leg of the next triangle.at n=6A048295
• McKay-Thompson series of class 21D for Monster.at n=26A058566
• Numbers n such that 7*3^n - 2 is prime.at n=32A058605
• Primes p such that x^48 = 2 has no solution mod p, but x^24 = 2 has a solution mod p.at n=30A059669
• a(n) is the smallest value of m such that prod(m) = n*length(m)*sum(m) where prod(m) is the product of the digits of m, length(m) is the number of digits of m, sum(m) is the sum of the digits of m; or 0 if no such m exists.at n=35A064022
• a(n) is the smallest prime m such that prod(m) = n*length(m)*sum(m) where prod(m) is the product of the digits of m, length(m) is the number of digits of m, sum(m) is the sum of the digits of m; or 0 if no such m exists.at n=35A064023
• Primes p such that 32p+1 and (p-1)/32 are both prime.at n=3A086476
• Primes with digit sum = 32.at n=16A106768
• Numbers n such that m=(n^2+1)/2, p=(m^2+1)/2 and q=(p^2+1)/2 are all prime.at n=17A188546
• a(n) = 3*a(n-1) + 2*a(n-2) for n>1, a(0)=2, a(1)=3.at n=8A206776
• McKay-Thompson series of class 21D for the Monster group with a(0) = 2.at n=26A226015
• Primes such that prime plus its digit sum is a perfect square.at n=12A230087
• Numbers that set a new integer record for the ratio between the product and the sum of their digits.at n=27A240520
• Odd numbers n containing 65536 as the highest power of 2 in their Collatz (3x+1) iteration.at n=5A247716
• Sum of the areas of all r X s rectangles such that r + s = 2n, with r, s composite.at n=39A334229
• a(n) = n*A340339(n)+b, where b = 1 if n is even or 2 if n is odd.at n=31A340340
• Primes having only {2, 5, 8, 9} as digits.at n=22A386164
• Prime numbersat n=2848