39059

Appears in sequences

• Smallest solution m to (n+1)*phi(m) = n*sigma(m), or -1 if no solution exists.at n=45A065824
• a(n) = A065824(A047845(n+1)).at n=22A065884
• Brilliant numbers k such that 2k+1 is also brilliant.at n=23A085649
• Numbers less than the maximum possible determinant A085000(4)=40800 not occurring as determinant of a 4 X 4 matrix with elements 1..16.at n=6A088237
• Lucas pseudoprimes.at n=29A217120
• Extra strong Lucas pseudoprimes.at n=8A217719
• Numbers of the form p*q, p and q prime with q=2*p+3.at n=17A226754
• Composite numbers for which the root mean square of proper divisors is an integer.at n=32A247135
• Composite numbers k such that Pell(k) == -1 (mod k).at n=6A319043
• Intersection of A099011 and A327651.at n=24A327652
• NSW pseudoprimes: odd composite numbers k such that A002315((k-1)/2) == 1 (mod k).at n=29A330276
• Odd composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 7 (mod m), where U(m) and V(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=7 and b=-1, respectively.at n=40A337630