|
Search: id:A163170
|
|
|
| A163170 |
|
Odd composite integers that are palindromes when written in binary. |
|
+0
1
|
|
| 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; listen)
|
|
|
OFFSET
|
1,1
|
|
|
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]
|
|
CROSSREFS
|
A016041
Sequence in context: A031879 A139787 A063139 this_sequence A097636 A007962 A061254
Adjacent sequences: A163167 A163168 A163169 this_sequence A163171 A163172 A163173
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jul 22 2009
|
|
EXTENSIONS
|
Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 24 2009
|
|
|
Search completed in 0.002 seconds
|
