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A175095
Integers of the form (2^j - 1)*(2^k + 1), j >= 0, k >= 0.
1
0, 2, 3, 5, 6, 9, 14, 15, 17, 21, 27, 30, 33, 35, 45, 51, 62, 63, 65, 75, 93, 99, 119, 126, 129, 135, 155, 189, 195, 231, 254, 255, 257, 279, 315, 381, 387, 455, 495, 510, 513, 527, 567, 635, 765, 771, 903, 975, 1022, 1023, 1025, 1071, 1143, 1275, 1533, 1539
OFFSET
1,2
LINKS
MATHEMATICA
mx = 1600; Join[{0}, Most@ Union@ Flatten@ Table[(2^j -1) (2^k +1), {j, Log2@ mx}, {k, 0, Log2[mx/(2^j -1)]} ]] (* Ivan Neretin, Feb 12 2018 and slightly modified by Robert G. Wilson v, Feb 13 2018 *)
CROSSREFS
Sequence in context: A087900 A101216 A371685 * A073216 A181902 A295631
KEYWORD
easy,nonn
AUTHOR
Leroy Quet, Feb 01 2010
EXTENSIONS
Extended by Ray Chandler and R. J. Mathar, Feb 06 2010
STATUS
approved