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Search: id:A158850
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| A158850 |
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Numbers n such that 30*n + 29 is prime. |
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+0
9
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| 0, 1, 2, 4, 5, 7, 8, 11, 12, 13, 14, 15, 16, 18, 19, 21, 23, 26, 27, 30, 33, 34, 36, 40, 41, 42, 43, 46, 47, 49, 51, 53, 56, 62, 64, 65, 67, 68, 69, 70, 76, 77, 79, 81, 84, 85, 86, 89, 90, 92, 93, 95, 96, 97, 98, 99, 102, 103, 106, 109, 110, 111, 112, 114, 117, 121, 123, 125
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Encoded primes with LSD 9 and (SOD-1)/3 non-integer, (LSD, least significant digit; SOD, sum of digits). Divide any such number by 30, if the whole number portion from the quotient is in the sequence, the number is prime.
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FORMULA
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a(n) = (A132236(n) - 29)/30 = Floor[A132236(n)/30]. - Chandler
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EXAMPLE
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Example: 3209 with LSD 9 and (SOD-1)/3 non-integer; Then 3209/30 = 106.966, or 106, which is in the sequence, thus 3209 is prime.
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CROSSREFS
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Cf. A111175, A158573, A158614, A158648, A158746, A158791, A158806.
Sequence in context: A127964 A085370 A006693 this_sequence A112886 A111040 A147807
Adjacent sequences: A158847 A158848 A158849 this_sequence A158851 A158852 A158853
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KEYWORD
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nonn
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AUTHOR
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Ki Punches (ki1212(AT)pocketmail.com), Mar 28 2009
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EXTENSIONS
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Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Apr 07 2009
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