71271827200
domain: N
Appears in sequences
- Numbers k whose average divisor is nonintegral and divides k.at n=23A046999
- a(1) = 2; a(n) for n > 1 is the smallest k > a(n-1) such that the harmonic mean of the divisors of k is one of the previous terms a(1), ..., a(n-1).at n=4A164829
- Numbers k for which sigma(k)/k - 1/5 is an integer.at n=12A218406
- Harmonic numbers k such that the harmonic mean of the divisors of k is also a harmonic number.at n=4A317476
- Harmonic numbers k with a record number of primes p not dividing k such that k*p is also a harmonic number.at n=9A335368