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1, 2, 3, 5, 7, 6, 9, 12, 9, 13, 17, 12, 17, 22, 15, 21, 27, 18, 25, 32, 21, 29, 37, 24, 33, 42, 27, 37, 47, 30, 41, 52, 33, 45, 57, 36, 49, 62, 39, 53, 67, 42, 57, 72, 45, 61, 77, 48, 65, 82, 51, 69, 87, 54, 73, 92, 57, 77, 97, 60, 81, 102, 63, 85, 107, 66, 89, 112, 69, 93, 117
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Three arithmetic progressions interlaced: a(1)=1,2,3 and d=a(n+1)-a(n)=4,5,3. Cf. A115273.
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FORMULA
| n+floor(n/3)*(n mod 3), n=1, 2, ...
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MATHEMATICA
| Table[n+Floor[n/3]*Mod[n, 3], {n, 78}]
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CROSSREFS
| Cf. A115273.
Sequence in context: A142349 A081622 A064143 * A126890 A122637 A076229
Adjacent sequences: A115271 A115272 A115273 * A115275 A115276 A115277
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KEYWORD
| nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Jan 18 2006
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