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A007379
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Earliest sequence with a(a(n)) = 4n.
(Formerly M0973)
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10
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0, 2, 4, 5, 8, 12, 7, 24, 16, 10, 36, 13, 20, 44, 15, 56, 32, 18, 68, 21, 48, 76, 23, 88, 28, 26, 100, 29, 96, 108, 31, 120, 64, 34, 132, 37, 40, 140, 39, 152, 144, 42, 164, 45, 52, 172, 47, 184, 80, 50, 196, 53, 176, 204, 55, 216, 60, 58, 228, 61, 224, 236, 63, 248
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| T. D. Noe, Table of n, a(n) for n=0..1000
Index entries for sequences of the a(a(n)) = 2n family
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FORMULA
| a(8n)=4*a(2n), a(8n+1)=8n+2, a(8n+2)=32n+4, a(8n+3)=8n+5, a(8n+4)=4*a(2n+1), a(8n+5)=32n+12, a(8n+6)=8n+7, a(8n+7)=32n+24
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CROSSREFS
| Cf. A002516, A002517.
Sequence in context: A039867 A080136 A080033 * A080588 A032850 A190190
Adjacent sequences: A007376 A007377 A007378 * A007380 A007381 A007382
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KEYWORD
| nonn,nice
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AUTHOR
| C. L. Mallows (colinm(AT)research.avayalabs.com), N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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EXTENSIONS
| Formula and more terms from Henry Bottomley (se16(AT)btinternet.com), Apr 27 2000
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