298418

Appears in sequences

• Numbers k for which phi(A267099(k)) is equal to phi(k), but the number of 4m+1 and 4m+3 primes in the prime factorization of k (when counted with multiplicity) is not equal. Here A267099 is fully multiplicative involution swapping the positions of 4m+1 and 4m+3 primes, and phi is Euler totient function.at n=22A354194
• Length of the n-th Golomb ruler constructed by the Paul Erdős and Pál Turán formula.at n=17A380790