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 A158850 Numbers n such that 30*n + 29 is prime. 8
 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; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS 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. LINKS FORMULA a(n) = (A132236(n) - 29)/30 = Floor[A132236(n)/30]. - Chandler EXAMPLE 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. PROG (PARI) is(n)=isprime(30*n+29) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A111175, A158573, A158614, A158648, A158746, A158791, A158806. Sequence in context: A085370 A006693 A281641 * A274427 A187576 A188298 Adjacent sequences:  A158847 A158848 A158849 * A158851 A158852 A158853 KEYWORD nonn AUTHOR Ki Punches, Mar 28 2009 EXTENSIONS Edited by Ray Chandler, Apr 07 2009 STATUS approved

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Last modified July 28 11:11 EDT 2021. Contains 346326 sequences. (Running on oeis4.)