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A092612 Product of first n primes that end in 7. 1

%I

%S 7,119,4403,206941,13865047,1344909559,143905322813,18275975997251,

%T 2503808711623387,393097967724871759,65647360610053583753,

%U 12932530040180555999341,2935684319120986211850407

%N Product of first n primes that end in 7.

%H Vincenzo Librandi, <a href="/A092612/b092612.txt">Table of n, a(n) for n = 1..200</a>

%e a(1)= 7 = 7

%e a(2)= 7*17 = 119

%e a(3)= 7*17*37 = 4403

%e a(4)= 7*17*37*47 = 206941

%t Rest[FoldList[Times,1,Select[Prime[Range[50]],Mod[#,10]==7&]]] (* _Harvey P. Dale_, Mar 01 2012 *)

%t FoldList[Times,Select[Prime[Range[50]],NumberDigit[#,0]==7&]] (* Requires Mathematica version 12.3 or later *) (* _Harvey P. Dale_, May 27 2021 *)

%K nonn

%O 1,1

%A _Jorge Coveiro_, Apr 11 2004

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Last modified January 21 22:08 EST 2022. Contains 350480 sequences. (Running on oeis4.)