26742
domain: N
Appears in sequences
- Aliquot sequence starting at 138.at n=18A008888
- Aliquot sequence starting at 150.at n=17A008889
- Aliquot sequence starting at 168.at n=15A008890
- Trajectory of 1 under map n->17n+1 if n odd, n->n/2 if n even.at n=21A033965
- Barely abundant numbers: abundant n such that sigma(n)/n < sigma(m)/m for all abundant numbers m<n, sigma(n) being the sum of the divisors of n.at n=14A071927
- Aliquot sequence starting at 570.at n=13A074907
- Number of partitions of n with even crank.at n=42A124227
- Number of base 22 circular n-digit numbers with adjacent digits differing by 3 or less.at n=5A125332
- Values of z in solutions (x,y,z) to the Diophantine equation x^3-x^2+y^3-y^2=z^3-z^2, with 1<x<y<z arranged in order of increasing x.at n=32A138669
- Values of n such that n^a-+a are primes, a=5.at n=28A155021
- Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+2x+3y>1.at n=19A211622
- Matula-Goebel numbers of unlabeled rooted identity RPMG-trees, meaning the Matula-Goebel numbers of the branches of any non-leaf node are relatively prime.at n=16A316469
- a(n) = Sum_{k=1..n} mu(k) * 2^(n - k).at n=18A344432