101743
domain: N
Appears in sequences
- Numbers n such that phi(phi(n)) + sigma(sigma(n)) is a 4th power.at n=39A172464
- Half the number of 0..7 arrays of length n+2 with second differences nonzero.at n=3A212781
- T(n,k)=Half the number of 0..k arrays of length n+2 with second differences nonzero.at n=48A212782
- Half the number of 0..n arrays of length 6 with second differences nonzero.at n=6A212785