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 A102546 Numbers t such that t1 is prime and t is a multiple of 10. 1
 10, 40, 60, 70, 120, 130, 160, 180, 190, 280, 300, 330, 370, 400, 420, 480, 510, 550, 570, 580, 610, 630, 670, 700, 790, 810, 850, 900, 960, 990, 1030, 1050, 1060, 1170, 1180, 1210, 1230, 1240, 1260, 1300, 1390, 1440, 1510, 1540, 1560, 1590, 1600, 1630, 1690, 1740, 1830, 1840, 1870 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE If t=10, then t1 = 101 (prime). If t=180, then t1 = 1801 (prime). If t=420, then t1 = 4201 (prime). MATHEMATICA Select[10*Range[200], PrimeQ[10#+1]&] (* Harvey P. Dale, Jan 10 2017 *) CROSSREFS Cf. A024912. Sequence in context: A197705 A187205 A104045 * A108777 A000132 A217073 Adjacent sequences:  A102543 A102544 A102545 * A102547 A102548 A102549 KEYWORD nonn,base AUTHOR Parthasarathy Nambi, Feb 24 2005 STATUS approved

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