

A124518


Numbers k such that 10k1 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
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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*t1), [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, A124519A124522, 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



