12999168

Appears in sequences

• Numbers n for which sigma(n)/n=k+2/3 with integer k.at n=8A160321
• Numbers k that divide 3*sigma(k).at n=27A245774
• Numbers k such that A017666(k) = denominator(sigma(k)/k) = 3.at n=16A245775
• Integers k such that numerator and denominator of sigma(k)/k are both prime.at n=34A247086
• Numbers m such that the sum of the first k divisors of m, for some k, is equal to the sum of its other divisors.at n=10A334410
• 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=13A349745
• Numbers k such that A353900(k) is divisible by k.at n=9A353901