2214502422

Appears in sequences

• Primary pseudoperfect numbers: numbers n > 1 such that 1/n + sum 1/p = 1, where the sum is over the primes p | n.at n=5A054377
• Composite numbers m such that (m'+1)' = m', where m' = A003415(m) is the arithmetic derivative of m.at n=8A185222
• Numbers m such that (m'+1)' = m-1, where m' is the arithmetic derivative of m.at n=16A203618
• Numbers n such that 1^(k*n) + 2^(k*n) + ... + (k*n)^(k*n) == k (mod k*n) for some k; that is, numbers n such that A031971(k*n) == k (mod k*n) for some k.at n=6A230311
• 1-Sondow numbers: numbers j such that p divides j/p + 1 for every prime divisor p of j.at n=6A349193