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 A124518 Numbers k such that 10k-1 and 10k+1 are twin primes. 10
 3, 6, 15, 18, 24, 27, 42, 57, 60, 66, 81, 102, 105, 123, 129, 132, 162, 195, 213, 231, 234, 255, 273, 279, 297, 300, 312, 330, 333, 336, 339, 354, 393, 402, 405, 423, 426, 465, 480, 501, 510, 528, 552, 564, 585, 588, 609, 627, 630, 636, 645, 657, 666, 669, 678 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are divisible by 3. - Robert Israel, Apr 07 2019 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE select(t -> isprime(10*t+1) and isprime(10*t-1), [seq(i, i=3..1000, 3)]); # Robert Israel, Apr 07 2019 MATHEMATICA Select[Range[678], And @@ PrimeQ[{-1, 1} + 10# ] &] (* Ray Chandler, Nov 16 2006 *) CROSSREFS Cf. A040040, A045753, A002822, A124065, A124519-A124522, A063983. Sequence in context: A224864 A176547 A310125 * A160724 A212060 A249246 Adjacent sequences:  A124515 A124516 A124517 * A124519 A124520 A124521 KEYWORD nonn AUTHOR Artur Jasinski, Nov 04 2006 STATUS approved

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Last modified July 29 13:28 EDT 2021. Contains 346346 sequences. (Running on oeis4.)