2278125

Appears in sequences

• Denominator of sum of -6th powers of divisors of n.at n=14A017676
• A modular recurrence.at n=11A100747
• Integers that are one third of their arithmetic derivatives.at n=7A282771
• Odd numbers k such that A173557(k) divides nonzero A051709(k).at n=22A345054
• Numbers k for which k = gcd(k', k"), where k' is the arithmetic derivative of k (A003415) and k" is the second derivative of k (A068346).at n=29A361078
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A052750.at n=51A384718
• Odd numbers of the form p^(1+4k) * r^2, where p is prime of the form 1+4m, k > 0, r > 1, and gcd(p,r) = 1.at n=9A386428