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Search: id:A061561
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| A061561 |
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Trajectory of 22 under the Reverse and Add! operation carried out in base 2. |
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+0
15
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| 22, 35, 84, 105, 180, 225, 360, 405, 744, 837, 1488, 1581, 3024, 3213, 6048, 6237, 12192, 12573, 24384, 24765, 48960, 49725, 97920, 98685, 196224, 197757, 392448, 393981, 785664, 788733, 1571328, 1574397, 3144192, 3150333, 6288384, 6294525
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Sequence A058042 written in base 10. 22 is the smallest number whose base 2 trajectory does not contain a palindrome.
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..500
K. Brockhaus, On the 'Reverse and Add!' algorithm in base 2
Index entries for sequences related to Reverse and Add!
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FORMULA
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a(0) = 22; a(1) = 35; for n > 1 and n = 2 (mod 4): a(n) = 6*2^(2*k)-3*2^k where k = (n+6)/4; n = 3 (mod 4): a(n) = 6*2^(2*k)+3*2^k-3 where k = (n+5)/4; n = 0 (mod 4): a(n) = 12*2^(2*k)-3*2^k where k = (n+4)/4; n = 1 (mod 4): a(n) = 12*2^(2*k)+9*2^k-3 where k = (n+3)/4. G.f.: -(112*x^9+80*x^8-60*x^7-48*x^6-90*x^5-72*x^4+18*x^2+35*x+22)/((x-1)*(x+1)*(2*x^2-1)*(2*x^4-1)). Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Sep 05 2002
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PROGRAM
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(ARIBAS) m := 22; stop := 36; c := 0; while c < stop do write(m, ", "); k := bit_length(m); rev := 0; for i := 0 to k-1 do if bit_test(m, i) then rev := bit_set(rev, k-1-i); end; end; inc(c); m := m+rev; end; .
(PARI) {m=22; stop=36; c=0; while(c<stop, print1(k=m, ", "); rev=0; while(k>0, d=divrem(k, 2); k=d[1]; rev=2*rev+d[2]); c++; m=m+rev)}
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CROSSREFS
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Cf. A058042, A075153.
Sequence in context: A125526 A124317 A100039 this_sequence A084141 A082261 A063252
Adjacent sequences: A061558 A061559 A061560 this_sequence A061562 A061563 A061564
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KEYWORD
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nonn,base
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AUTHOR
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njas, May 18 2001
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EXTENSIONS
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More terms from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), May 27 2001
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