106261

Properties

Appears in sequences

• Numbers having exactly four anti-divisors.at n=31A066469
• Prime hypotenuses of Pythagorean triangles with a prime leg.at n=19A067756
• Primes of the form (4*k + 3)^2 + (4*k + 2)^2 where k=0,1,2,3,...at n=19A087872
• (Prime(prime(n))^2+1)/2.at n=23A092773
• Primes of the form 8*n^2 + 4*n + 1.at n=36A102130
• a(n) = a(n-1) + a(n-2) + 5 where a(0) = a(1) = 1.at n=21A111721
• Primes of the form 50n^2 + 10n + 1.at n=20A154428
• Primes of the form (p^k + k - 1)/k for prime p and some k > 1.at n=26A230444
• Array of coefficients a(k,n) of the formal power series A(k,x) read by upwards antidiagonals, where A(k,x) = ((2*k+1)*x+sqrt(1+4*k*(k+1)*x^2))/(1-x^2), k>=0.at n=72A277930
• Hypotenuses of primitive Pythagorean triangles two sides of which are Pythagorean primes.at n=8A308341
• Primes of the form (p^k+1)/2 where p is prime and k > 1.at n=25A308442
• a(n) = n! * Sum_{k=0..floor(n/4)} (n - 4*k)^k/(24^k * (n - 4*k)!).at n=11A356608
• Prime numbersat n=10126