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%I #22 Oct 26 2023 08:31:24
%S 1,2,4,7,8,14,16,17,28,32,34,37,47,49,56,64,67,68,74,94,97,98,107,112,
%T 119,127,128,134,136,137,148,157,167,188,194,196,197,214,224,227,238,
%U 254,256,257,259,268,272,274
%N Divisible only by primes congruent to 2 mod 5.
%H Vincenzo Librandi, <a href="/A004616/b004616.txt">Table of n, a(n) for n = 1..1000</a>
%t ok[1] = True; ok[n_] := And@@ (Mod[#, 5] == 2 &)/@ FactorInteger[n][[All,1]]; Select[Range[2000],ok] (* _Vincenzo Librandi_, Aug 11 2012 *)
%o (Magma) [n: n in [1..300] | forall{d: d in PrimeDivisors(n) | d mod 5 eq 2}]; // _Bruno Berselli_, Aug 11 2012
%Y Cf. A045380 (primes congruent to 2 mod 5).
%K nonn
%O 1,2
%A _N. J. A. Sloane_
%E Offset changed from 0 to 1 by _Vincenzo Librandi_, Aug 20 2012
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