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
Offset: 1
Examples
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.
Crossrefs
Cf. A101471.
Programs
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Mathematica
Select[Range[0,2270,10],PrimeQ[FromDigits[Prepend[{1,1},#]]]&] (* James C. McMahon, Jan 20 2024 *)