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Search: id:A097273
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| A097273 |
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Least integer with each "mod 2 prime signature". |
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+0
4
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| 1, 2, 3, 4, 6, 8, 9, 12, 15, 16, 18, 24, 27, 30, 32, 36, 45, 48, 54, 60, 64, 72, 81, 90, 96, 105, 108, 120, 128, 135, 144, 162, 180, 192, 210, 216, 225, 240, 243, 256, 270, 288, 315, 324, 360, 384, 405, 420, 432, 450, 480, 486, 512, 540, 576, 630, 648, 675, 720
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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For n=2^a_0*p_1^a_1*...*p_n^a_n where p_i is odd prime and a_1>=a_2>=...>=a_n, define "mod 2 prime signature" to be ordered prime exponents (a_0,a_1,...,a_n).
Least integer with a given mod 2 prime signature is obtained by replacing p_1 with 3, p_2 with 5,..., p_n with n-th odd prime.
A097272 sorted and duplicates removed; n such that A097272(n)=n.
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CROSSREFS
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Cf. A097272, A097274, A097275.
Sequence in context: A145807 A122380 A033501 this_sequence A006446 A002348 A019469
Adjacent sequences: A097270 A097271 A097272 this_sequence A097274 A097275 A097276
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KEYWORD
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nonn
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AUTHOR
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Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 22 2004
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