34082
domain: N
Appears in sequences
- a(n) = (sum of first n primes)^2 - sum of squares of first n primes.at n=11A065595
- Self-convolution with "addition" played by bitwise XOR.at n=11A199770
- Number of compositions (ordered partitions) of n into primes of form x^2 + y^2 (A002313).at n=50A282971
- Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 5.at n=15A296812
- E.g.f. satisfies A(x) = 1 / (2 - exp(x * A(x)^(1/2)))^2.at n=5A375897