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Search: id:A159021
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| A159021 |
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a(0)=19; a(n)=a(n-1)+[sqrt(a(n-1)], n>0 . |
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1
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| 19, 23, 27, 32, 37, 43, 49, 56, 63, 70, 78, 86, 95, 104, 114, 124, 135, 146, 158, 170, 183, 196, 210, 224, 238, 253, 268, 284, 300, 317, 334, 352, 370, 389, 408, 428, 448, 469, 490, 512, 534, 557, 580, 604, 628, 653, 678, 704, 730, 757, 784, 812, 840, 868, 897, 926, 956, 986, 1017
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Row 3 in square array A159016 .
This sequence contains an infinity of squares . [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Apr 04 2009] The squares are the form [7*2^n]^2 with a(n)=7*2^n [A005009] (7,14,28,56,..) (From vincenzo.librandi(AT)tin.it)
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CROSSREFS
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Cf. A028392,A005009
Sequence in context: A072305 A095222 A070299 this_sequence A100460 A166061 A073319
Adjacent sequences: A159018 A159019 A159020 this_sequence A159022 A159023 A159024
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Apr 02 2009
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EXTENSIONS
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More terms and comments from Vincezo Librandi (vincenzo.librandi(AT)tin.it), Apr 10 2009
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