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A163170
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Odd composite integers that are palindromes when written in binary.
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0
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9, 15, 21, 27, 33, 45, 51, 63, 65, 85, 93, 99, 119, 129, 153, 165, 189, 195, 219, 231, 255, 273, 297, 325, 341, 365, 381, 387, 403, 427, 455, 471, 495, 511, 513, 561, 585, 633, 645, 693, 717, 765, 771, 819, 843, 891, 903, 951, 975, 1023, 1025, 1057, 1105, 1137
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MAPLE
| rev := proc (n) local nn: nn := convert(n, base, 10): add(nn[j]*10^(nops(nn)-j), j = 1 .. nops(nn)) end proc: a := proc (n) local n2: n2 := convert(n, binary): if 1 < n and `mod`(n, 2) = 1 and isprime(n) = false and rev(n2) = n2 then n else end if end proc: seq(a(n), n = 1 .. 1500); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 24 2009]
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CROSSREFS
| A016041
Sequence in context: A139787 A172181 A063139 * A097636 A179384 A007962
Adjacent sequences: A163167 A163168 A163169 * A163171 A163172 A163173
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KEYWORD
| base,nonn
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AUTHOR
| Leroy Quet, Jul 22 2009
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EXTENSIONS
| Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 24 2009
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