206158168064
domain: N
Appears in sequences
- Solutions to k + 2*phi(k) = sigma(k) where phi is A000010 and sigma is A000203.at n=15A076373
- Numbers m such that A076078(m) = m and bigomega(m) >= 2; or in other words, A097214, excluding powers of 2.at n=9A097215
- Number of 2 X n binary matrices M with rows in strictly increasing order and rows of M*Mtranspose (mod 2) in strictly increasing order.at n=19A181270
- Numbers n such that Sum_{i=1..k} 1/p(i) + Sum_{i=1..j} 1/d(i) is an integer, where p are the prime factors of n, counted with multiplicity, and d its divisors.at n=19A224346
- Integers m such that sigma(m) + sigma(2*m) = 6*m.at n=7A281993
- a(n) is the smallest multiple k of 2^n such that |sigma(k) - 2*k| = 2^n, where sigma = A000203.at n=18A363285