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 A158614 Numbers n such that 30*n + 11 is prime. 9
 0, 1, 2, 3, 4, 6, 8, 9, 10, 13, 14, 15, 16, 17, 21, 23, 25, 27, 29, 30, 31, 32, 34, 35, 36, 38, 39, 43, 45, 48, 49, 50, 52, 53, 57, 60, 62, 63, 64, 69, 70, 71, 78, 79, 80, 81, 84, 86, 87, 90, 91, 93, 95, 100, 101, 106, 107, 108, 112, 115, 116, 119, 122, 123, 125, 127, 128 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Encoded primes with LSD 1 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 of the quotient is in the sequence, the number is prime. LINKS Ivan Neretin, Table of n, a(n) for n = 1..10000 FORMULA a(n) = (A132232(n) - 11)/30 = floor(A132232(n)/30). - Ray Chandler, Apr 07 2009 EXAMPLE Example: 3191, with LSD 1 and (SOD-1)/3 = 4.33 (non-integer); Then 3191/30=106.367, or 106 which is in the sequence, thus 3191 is prime. MATHEMATICA Select[Range[0, 130], PrimeQ[30#+11]&] (* Harvey P. Dale, Jul 26 2011 *) PROG (PARI) is(n)=isprime(30*n+11) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A111175, A158573, A158648, A158746, A158791, A158806, A158850. Sequence in context: A188591 A002183 A060306 * A303434 A080823 A117925 Adjacent sequences:  A158611 A158612 A158613 * A158615 A158616 A158617 KEYWORD nonn AUTHOR Ki Punches, Mar 22 2009, Mar 29 2009 EXTENSIONS Edited by Ray Chandler, Apr 07 2009 STATUS approved

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Last modified August 4 01:57 EDT 2020. Contains 336201 sequences. (Running on oeis4.)