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Search: id:A089719
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| A089719 |
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Pseudofactor sets of primes ending in 1: 9 greater than 3. |
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+0
1
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| 31, 41, 61, 71, 131, 151, 211, 241, 251, 311, 331, 401, 421, 431, 491, 521, 571, 601, 661, 691, 701, 751, 761, 881, 941, 971, 1021, 1031, 1051, 1061, 1151, 1201, 1231, 1291, 1301, 1321, 1381, 1471, 1481, 1511, 1571, 1601, 1741, 1831, 1861, 1871, 1931
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OFFSET
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1,1
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COMMENT
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These pseudofactors although not unique sets as their domains seem to overlap form twelve subsets of primes based on the first digit set {1,3,7,9} when {2,5} are taken away from the prime set. I'm entering the four {1}'s sets. There exist {3}'s, {7}'s and {9}'s sets of these same four types.
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FORMULA
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a[n]=Primes ending in one b(m) = if Mod[a[[n]]/9, 10]>3 then a[n]
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MATHEMATICA
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digits=4*200 a=Delete[Union[Table[If[Mod[Prime[n], 10]==1, Prime[n], 0], {n, 1, digits}]], 1] d2=Dimensions[a][[1]] a9g3=Delete[Union[Table[If[Mod[a[[n]]/9, 10]>3, a[[n]], 0], {n, 1, d2}]], 1]
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CROSSREFS
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Sequence in context: A040969 A088555 A040178 this_sequence A109550 A040991 A089721
Adjacent sequences: A089716 A089717 A089718 this_sequence A089720 A089721 A089722
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KEYWORD
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nonn,uned
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jan 06 2004
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