A258159 Numbers n such that A053645(n) (n with the most significant binary digit removed) divides A004526(n) (n with the least significant binary digit removed).

3, 5, 7, 9, 15, 17, 19, 21, 31, 33, 63, 65, 67, 71, 73, 85, 127, 129, 255, 257, 259, 261, 271, 273, 307, 341, 511, 513, 519, 585, 1023, 1025, 1027, 1035, 1055, 1057, 1117, 1365, 2047, 2049, 2071, 2137, 4095, 4097, 4099, 4101, 4103, 4105, 4109, 4111, 4117, 4131, 4135, 4141, 4159

Offset

1,1

Comments

Also, numbers of the form 2^k + d, where d is any divisor of (2^k - 1).

Links

Ivan Neretin, Table of n, a(n) for n = 1..1091

Mathematica

Flatten[Table[2^n + Divisors[2^n - 1], {n, 15}]]

Crossrefs

Sequence in context: A121820 A357150 A351462 * A238257 A305409 A342572

Adjacent sequences: A258156 A258157 A258158 * A258160 A258161 A258162

Keyword

nonn,base

Author

Ivan Neretin, Jul 26 2015

Status

approved