510509
domain: N
Appears in sequences
- Kummer numbers: -1 + product of first n consecutive primes.at n=6A057588
- Semiprimes of the form primorial(k) - 1.at n=1A104876
- Composite Kummer numbers: -1 + product of first n consecutive primes (A057588).at n=1A125549
- Square array A(n,k) = A276945(n,k)-1, read by descending antidiagonals: A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), etc.at n=28A286615
- Transpose of square array A286615.at n=35A286616
- Numbers k where records occur for phi(k)/phi(k+1), where phi is the Euler totient function (A000010).at n=34A335070
- Möbius transform of A108951, the primorial inflation of n.at n=16A347379
- Möbius transform of A108951, the primorial inflation of n.at n=33A347379
- a(n) = A276085(n) - A003415(n), where A003415 is the arithmetic derivative and A276085 is the primorial base log-function.at n=18A373146
- a(n) is the least k for which omega(k)*omega(k + 1) = n where omega = A001221.at n=14A391216