This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A171179 #8 Jan 15 2024 13:37:02 %S A171179 12,18,30,42,102,138,282,618,642,822,1698,1878,2082,2238,2382,2658, %T A171179 2802,3462,3558,3918,4638,4722,5442,6198,6702,8538,8598,9678,10938, %U A171179 12162,12378,12822,12918,13218,13722,13758,13998,14082,16062,17418,19542 %N A171179 Numbers that are divisible by exactly 3 primes (counted with multiplicity) and sandwiched between primes. %C A171179 There are 106 of these numbers below 10^5. %e A171179 12 is a term: 12 = 2*2*3, and 11 and 13 primes. %t A171179 Select[Range[9! ],Plus@@Last/@FactorInteger[ # ]==3&&PrimeQ[ #-1]&&PrimeQ[ #+1]&] %Y A171179 Cf. A014612. %Y A171179 Equals 6*A060212. - _Zak Seidov_ and _Esko Ranta_, Dec 06 2009 %K A171179 nonn %O A171179 1,1 %A A171179 _Vladimir Joseph Stephan Orlovsky_, Dec 04 2009