271215

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+3).at n=9A015861
• Numbers k such that sigma(sigma(k)) == phi(k) (mod sigma(k)).at n=32A067204
• Odd doubly abundant numbers (A125639).at n=19A129087
• Numbers k such that k and k+1 are both in A357605.at n=9A357608
• Numbers k such that k and k+1 both have an odd number of abundant divisors.at n=17A381548