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

1,2

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

Cf. A101471.

Sequence in context: A095787 A198471 A120145 * A078499 A066027 A256227

Adjacent sequences: A104045 A104046 A104047 * A104049 A104050 A104051

Keyword

base,nonn

Author

Parthasarathy Nambi, Mar 01 2005

Status

approved