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A067255
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Irregular triangle read by rows: row n gives exponents in prime factorization of n.
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4
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0, 1, 0, 1, 2, 0, 0, 1, 1, 1, 0, 0, 0, 1, 3, 0, 2, 1, 0, 1, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 4, 0, 0, 0, 0, 0, 0, 1, 1, 2, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 1, 0, 0, 2, 1, 0, 0, 0, 0, 1, 0, 3, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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COMMENTS
| Lengths of the runs are given by A061395(n),n>=2: [1,2,1,3,2,4,1,2,... ].
This sequence contains every finite sequence of nonnegative integers. - Frank Adams-Watters (FrankTAW(AT)Netscape.net), Jun 22 2005
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LINKS
| Jeppe Stig Nielsen, See this explanation.
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EXAMPLE
| 1 = 2^0
2 = 2^1
3 = 2^0 3^1
4 = 2^2
5 = 2^0 3^0 5^1
6 = 2^1 3^1
... and reading the exponents gives the sequence.
Since for example 99=2^0*3^2*5^0*7^0*11^1, we use this symbol for ninety-nine: 99: {0,2,0,0,1}. Concatenating all the symbols for 1,2,3,4,5,6,..., we get the sequence.
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CROSSREFS
| Cf. A133457.
Cf. A001222, which gives the row sums of this table.
For another version see A143078.
Sequence in context: A001842 A029429 A064559 * A065716 A079409 A114643
Adjacent sequences: A067252 A067253 A067254 * A067256 A067257 A067258
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KEYWORD
| easy,nonn,tabf
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AUTHOR
| Jeppe Stig Nielsen (sequence(AT)jeppesn.dk), Feb 20 2002
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