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Search: id:A158806
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| A158806 |
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Numbers n such that 30*n + 19 is prime. |
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+0
9
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| 0, 2, 3, 4, 6, 7, 11, 12, 13, 14, 16, 20, 23, 24, 25, 27, 28, 30, 33, 34, 35, 37, 41, 42, 46, 47, 48, 49, 51, 52, 53, 55, 56, 58, 59, 62, 66, 67, 69, 72, 74, 75, 79, 84, 88, 89, 90, 91, 100, 101, 102, 103, 105, 107, 108, 110, 115, 116, 117, 118, 123, 124, 125, 129, 130
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Encoded primes with LSD 9, (SOD-1)/3 integer, (LSD, least significant digit; SOD, sum of digits). Divide any such number by 30, if the whole number portion of the quotient is in the sequence, the number is prime.
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FORMULA
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a(n) = (A132234(n) - 19)/30 = Floor[A132234(n)/30]. - Chandler
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EXAMPLE
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Example: 3019, with LSD 9, (SOD-1)/3 integer; Then 3019/30 = 100.633, or 100, which is in the sequence, thus 3019 is prime.
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CROSSREFS
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Cf. A111175, A158573, A158614, A158648, A158746, A158791, A158850.
Sequence in context: A163771 A117851 A050679 this_sequence A018723 A088412 A074177
Adjacent sequences: A158803 A158804 A158805 this_sequence A158807 A158808 A158809
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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 27 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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