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 A158746 Numbers n such that 30*n + 13 is prime. 8
 0, 1, 2, 3, 5, 6, 7, 9, 10, 12, 14, 15, 17, 20, 21, 22, 24, 27, 28, 29, 34, 35, 36, 37, 38, 40, 43, 47, 48, 49, 51, 55, 56, 57, 58, 59, 62, 64, 66, 68, 69, 70, 71, 73, 76, 79, 82, 83, 86, 89, 90, 93, 94, 98, 105, 108, 110, 111, 112, 114, 115, 119, 120, 121, 122, 124, 126, 127 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Encoded primes with LSD 3, (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. LINKS Table of n, a(n) for n=1..68. FORMULA a(n) = (A132233(n) - 13)/30 = Floor[A132233(n)/30]. - Chandler EXAMPLE Example: 3163, with LSD 3 and (SOD-1)/3 = 4 (integer); Then 3163/30 = 105.433, or 105 which is in the sequence, thus 3163 is prime. MATHEMATICA Select[Range[0, 200], PrimeQ[30#+13]&] (* Harvey P. Dale, Oct 16 2018 *) PROG (PARI) is(n)=isprime(30*n+13) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A111175, A158573, A158614, A158648, A158791, A158806, A158850. Sequence in context: A248229 A207672 A038161 * A062470 A179460 A344281 Adjacent sequences: A158743 A158744 A158745 * A158747 A158748 A158749 KEYWORD nonn AUTHOR Ki Punches, Mar 25 2009 EXTENSIONS Edited by Ray Chandler, Apr 07 2009 STATUS approved

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Last modified June 15 13:08 EDT 2024. Contains 373407 sequences. (Running on oeis4.)