OFFSET
1,2
COMMENTS
For a guide to related sequences, see A204892.
(Conjecture) Equivalently, the solution set of 2^p * (2^q - 1) = x * y, OR 2^q - 1 = 2^p * x * y, for at most one of the naturals x and y being given; unknown p and q in the integers; then a(n) = 2^p * (2^q - 1) where p and q are directly related to n (see formula). - Andrew T. Porter, Dec 20 2022
FORMULA
MATHEMATICA
(See the program at A204979.)
PROG
(PARI) a(n) = for (k=1, oo, for (j=1, k-1, my(d=2^(k-1)-2^(j-1)); if (!(d % n), return(d)); ); ); \\ Michel Marcus, Sep 16 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 21 2012
STATUS
approved