102136320

Appears in sequences

• Numbers k such that gcd(sigma(k),k) = k/5.at n=26A067237
• Numbers k for which sigma(k)/k - 1/5 is an integer.at n=8A218406
• Numbers k such that k divides lcm(tau(k), sigma(k)).at n=32A307740
• Numbers whose numerator and denominator of their abundancy index are both Fibonacci numbers.at n=36A349687
• Numbers k for which k * gcd(sigma(k), A003961(k)) is equal to sigma(k) * gcd(k, A003961(k)), where A003961 shifts the prime factorization one step towards larger primes, and sigma is the sum of divisors function.at n=19A349745