71765

Appears in sequences

• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2*n - 3 - 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) = 2.at n=16A049936
• 3-almost prime octagonal numbers.at n=34A129927
• Short leg A of primitive Pythagorean triangles such that perimeters and products of 3 sides are Averages of twin prime pairs, q=p+1, a=q^2-p^2, c=q^2+p^2, b=2*p*q, ar=a*b/2; s=a+b+c, s-+1 are primes, pr=a*b*c, pr-+1 are primes.at n=2A155180
• p*(p+2)/3 where p and p+4 are primes.at n=24A181093
• G.f. A(x) = Sum_{n>=0} x^n*(A(x)^n + sqrt(2))^n/(1 + sqrt(2)*x*A(x)^n)^(n+1).at n=10A324620
• Octagonal numbers that are the product of three distinct primes.at n=29A382231