Search: id:A113008
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%I A113008
%S A113008 15121,35521,52321,117841,235441,313561,398821,516421,520021,531121,
%T A113008 570601,623641,761113,838561,941041,1117321,1190821,1317361,1333621,
%U A113008 1336177,1372081,1413793,1424041,1431361,1488901,1513921,1560121
%N A113008 Numbers n such that n, n+1, n+2, n+3 and n+4 are respectively 1,2,3,4,
               5-almost primes.
%e A113008 15121 is prime (or 1-almost prime), 15122=2*7561 is semiprime (or 2-almost 
               prime), 15123=3*71*71 is 3-almost prime, 15124=2*2*29*199 is 4-almost 
               prime, 15125=5*5*5*11*11 is 5-almost prime.
%t A113008 f[n_] := Plus @@ Last /@ FactorInteger@n; t = {}; Do[p = Prime[n]; If[Array[ 
               f[p + # ] &, 4] == {2, 3, 4, 5}, AppendTo[t, p]], {n, 126483}]; t 
               (* Robert G. Wilson v *)
%Y A113008 Sequence in context: A147578 A151595 A124047 this_sequence A004935 A004955 
               A004975
%Y A113008 Adjacent sequences: A113005 A113006 A113007 this_sequence A113009 A113010 
               A113011
%K A113008 nonn
%O A113008 1,1
%A A113008 Zak Seidov (zakseidov(AT)yahoo.com), Jan 03 2006
%E A113008 More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Jan 05 2006

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