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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). 1
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 (list; graph; refs; listen; history; text; internal format)
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: A145388 A268496 A121820 * A238257 A305409 A329358

Adjacent sequences:  A258156 A258157 A258158 * A258160 A258161 A258162

KEYWORD

nonn,base

AUTHOR

Ivan Neretin, Jul 26 2015

STATUS

approved

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Last modified August 14 08:08 EDT 2020. Contains 336480 sequences. (Running on oeis4.)