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 A153215 Primes p such that none of p-2, p-1, p+1, and p+2 is squarefree. 1
 727, 1423, 1861, 3719, 6173, 9749, 11321, 13183, 19073, 20873, 23227, 23473, 23827, 26981, 27883, 34351, 35323, 41263, 42677, 44449, 45127, 45523, 47527, 48751, 49727, 52391, 53623, 53849, 68749, 71993, 72559, 78823, 83609, 89227, 92779 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 MATHEMATICA << NumberTheory`NumberTheoryFunctions` lst={}; Do[p=Prime[n]; If[ !SquareFreeQ[p-1]&&!SquareFreeQ[p+1]&&!SquareFreeQ[p-2]&&!SquareFreeQ[p+2], AppendTo[lst, p]], {n, 4*7!}]; lst CROSSREFS Cf. A049282, A049097, A039787, A075432, A153207, A153208, A153209, A153210, A153213, A153214. Sequence in context: A108846 A052234 A103170 * A129117 A158394 A038600 Adjacent sequences:  A153212 A153213 A153214 * A153216 A153217 A153218 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, Dec 20 2008 STATUS approved

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Last modified February 25 23:44 EST 2020. Contains 332270 sequences. (Running on oeis4.)