# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a112783 Showing 1-1 of 1 %I A112783 #9 Nov 14 2021 17:35:51 %S A112783 2,47,947,18947,947357,47367857,4263107137,682097141927, %T A112783 545677713541607,65481325624992847,21608837456247639517, %U A112783 4105679116687051508237,944306196838021846894517 %N A112783 Beginning with 2, primes of the form: least multiple of the previous term followed by a 7. Beginning with 2, a(n) is the least prime of the form k*a(n-1)*10 +7. %H A112783 Michael De Vlieger, Table of n, a(n) for n = 1..300 %t A112783 NestList[Block[{k = 1, m}, While[! PrimeQ[Set[m, 10 k # + 7]], k++]; m] &, 2, 12] (* _Michael De Vlieger_, Nov 14 2021 *) %Y A112783 Cf. A112782, A112784. %K A112783 base,nonn %O A112783 1,1 %A A112783 _Amarnath Murthy_, Jan 02 2006 %E A112783 More terms from _Joshua Zucker_, Jan 11 2006 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE