A104044 Numbers k such that 10*k + 7 is prime and k is a multiple of ten.

0, 10, 30, 60, 90, 130, 160, 190, 220, 270, 330, 340, 360, 390, 400, 450, 510, 540, 550, 580, 600, 660, 690, 720, 730, 750, 760, 790, 870, 880, 900, 990, 1000, 1060, 1180, 1200, 1210, 1290, 1300, 1380, 1390, 1410, 1420, 1440, 1510

Offset: 1

Author

Parthasarathy Nambi, Mar 01 2005

Keywords

• base
• nonn

Examples

			If t=10, then 10*t + 7 = 107 (prime).
If t=220, then 10*t + 7 = 2207 (prime).
If t=450, then 10*t + 7 = 4507 (prime).
		

Programs

Mathematica

Select[10 Range[0,500],PrimeQ[10#+7]&] (* Harvey P. Dale, Dec 09 2010 *)

Extensions

More terms from Harvey P. Dale, Dec 09 2010

a(1)=0 inserted by Georg Fischer, Jan 03 2021