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 A246965 Numbers n such that 19*n-(n+19) is a prime. 1
 2, 4, 5, 6, 7, 11, 12, 14, 15, 16, 21, 25, 26, 27, 29, 30, 32, 34, 37, 39, 40, 41, 44, 46, 47, 49, 50, 54, 55, 60, 62, 65, 67, 69, 71, 72, 77, 81, 84, 85, 89, 90, 91, 92, 96, 105, 106, 107, 111, 112, 116, 117, 120, 124, 127, 131, 132, 134, 135, 137, 145, 146 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Jens Kruse Andersen, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A138918(n)+1. EXAMPLE 17 = (19*2)-(19+2) is prime, so 2 is a term. MATHEMATICA Select[Range[150], PrimeQ[18#-19]&] (* Harvey P. Dale, Jun 10 2016 *) PROG (PHP) for(\$num=1; \$num

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Last modified December 8 07:12 EST 2023. Contains 367662 sequences. (Running on oeis4.)