

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
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OFFSET

1,3


COMMENTS

Encoded primes with LSD 3, (SOD1)/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



FORMULA



EXAMPLE

Example: 3163, with LSD 3 and (SOD1)/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



CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



