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A104048

Numbers k such that k11 is prime and k is a multiple of ten.

0, 20, 30, 50, 60, 80, 90, 120, 140, 170, 200, 210, 230, 270, 300, 360, 380, 410, 540, 590, 620, 650, 690, 710, 750, 840, 860, 870, 900, 980, 1080, 1130, 1200, 1220, 1260, 1290, 1310, 1460, 1470, 1490, 1500, 1560, 1620, 1640, 1770, 1820, 1880, 1890, 2010, 2030, 2100, 2220, 2240, 2270

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..54.

EXAMPLE

20 is a term because it is a multiple of 10 and 2011 is a prime.

170 is a term because it is a multiple of 10 and 17011 is a prime.

360 is a term because it is a multiple of 10 and 36011 is a prime.

MATHEMATICA

Select[Range[0, 2270, 10], PrimeQ[FromDigits[Prepend[{1, 1}, #]]]&] (* James C. McMahon, Jan 20 2024 *)

CROSSREFS