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Search: id:A078309
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| A078309 |
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Congruent to 1, 4 or 7 mod 10. |
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+0
1
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| 1, 4, 7, 11, 14, 17, 21, 24, 27, 31, 34, 37, 41, 44, 47, 51, 54, 57, 61, 64, 67, 71, 74, 77, 81, 84, 87, 91, 94, 97, 101, 104, 107, 111, 114, 117, 121, 124, 127, 131, 134, 137, 141, 144, 147, 151, 154, 157, 161, 164, 167, 171, 174, 177, 181, 184, 187, 191, 194, 197
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The formula 1 + 3*Mod[n-1, 3] + Floor[2/7 + (n-1)/n] * 10^Floor[(n-1)/3] produces a sequence with the same first 6 terms.
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FORMULA
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a(n) = 1 + 3*Mod[n-1, 3] + 10*Floor[(n-1)/3].
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MATHEMATICA
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Table[1 + 3*Mod[n - 1, 3] + 10*Floor[(n - 1)/3], {n, 1, 55}]
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CROSSREFS
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The sequence begins with the same first 6 terms as the 'Straight' sequence (A028373).
Sequence in context: A092403 A102737 A081834 this_sequence A028373 A083051 A047345
Adjacent sequences: A078306 A078307 A078308 this_sequence A078310 A078311 A078312
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KEYWORD
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nonn,easy
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AUTHOR
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Jochen Ziegenbalg (ziegenbalg(AT)ph-karlsruhe.de), Dec 23 2002
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EXTENSIONS
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Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 24 2002
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