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Search: id:A076307
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| A076307 |
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a(1)=1 a(n+1)=n+1+min(2*floor(a(n)/2); 3*floor(a(n)/3)). |
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+0
2
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| 1, 2, 3, 6, 11, 15, 21, 28, 36, 46, 56, 66, 79, 92, 105, 120, 137, 153, 171, 190, 210, 232, 254, 276, 301, 326, 351, 378, 407, 435, 465, 496, 528, 562, 596, 630, 667, 704, 741, 780, 821, 861, 903, 946, 990, 1036, 1082, 1128, 1177, 1226, 1275, 1326, 1379, 1431
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n) = n*(n-1)/2 + b(n) where b(n) is the periodic sequence (1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0) of length 12
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CROSSREFS
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Sequence in context: A042944 A090304 A005211 this_sequence A102990 A138519 A138520
Adjacent sequences: A076304 A076305 A076306 this_sequence A076308 A076309 A076310
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 06 2002
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