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Search: id:A109030
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| A109030 |
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10-almost primes (A046314) whose digit reversal is different and also has 10 prime factors (with multiplicity). "Emirp Tsolma-10.". |
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+0
4
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| 46848, 84864, 217152, 219456, 232848, 251712, 257664, 259776, 274104, 276048, 401472, 415584, 422820, 428160, 428736, 447360, 466752, 485514, 637824, 650160, 654912, 677952, 808320, 840672, 846369, 848232, 963648
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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This sequence is the k = 10 instance of the series which begins with k = 1 (emirps), k = 2 (emirpimes), k = 3 (emirp tsolma-3 = A109023), k = 4 (emirp tsolma-4 = A109024), k = 5 (emirp tsolma-5 = A109025), k = 6 (emirp tsolma-6 = A109026), k = 7 (emirp tsolma-7 = A109027), k = 8 (emirp tsolma-8 = A109028), k = 9 (emirp tsolma-9 = A109029).
The Mathematica code for this was written by Ray Chandler who extended this sequence. He also has more values.
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REFERENCES
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Jonathan Vos Post, "1066 and All That: Emirp Tsolma-3 and Related Integer Sequences." Forthcoming paper on this sequence.
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LINKS
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Eric Weisstein's World of Mathematics, Almost Prime.
Eric Weisstein's World of Mathematics, Emirp.
Eric Weisstein and Jonathan Vos Post, Emirpimes.
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EXAMPLE
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a(1) = 46848 is in this sequence because 46848 = 2^8 * 3 * 61 is a 10-almost prime and reverse(46848) = 84864 = 2^7 * 3 * 13 * 17 is also a 10-almost prime.
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CROSSREFS
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Cf. A046314, A006567, A097393, A109018, A109023-A109029, A109031-A109131.
Adjacent sequences: A109027 A109028 A109029 this_sequence A109031 A109032 A109033
Sequence in context: A132642 A052359 A066359 this_sequence A093223 A069370 A166003
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KEYWORD
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nonn,base
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 16 2005
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