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 A153213 Primes p such that both p-2 and p+2 are not squarefree. 9
 2, 47, 173, 277, 727, 839, 929, 1181, 1423, 1447, 1523, 1627, 1811, 1847, 1861, 1973, 2207, 2297, 2423, 2693, 3323, 3701, 3719, 3877, 4327, 4363, 4457, 4673, 4691, 4903, 5227, 5573, 5821, 5927, 6173, 6221, 6323, 6473, 6577, 6653, 7027, 7103, 7477, 7823 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS John Cerkan, Table of n, a(n) for n = 1..10000 MATHEMATICA lst={}; Do[p=Prime[n]; If[ !SquareFreeQ[p-2]&&!SquareFreeQ[p+2], AppendTo[lst, p]], {n, 7!}]; lst PROG (PARI) is(n)=isprime(n) && !issquarefree(n-2) && !issquarefree(n+2) \\ Charles R Greathouse IV, Nov 05 2017 CROSSREFS Cf. A049282, A049097, A039787, A075432, A153207, A153208, A153209, A153210. Sequence in context: A065044 A142313 A264776 * A355009 A304725 A128822 Adjacent sequences: A153210 A153211 A153212 * A153214 A153215 A153216 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, Dec 20 2008 STATUS approved

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Last modified May 29 10:24 EDT 2024. Contains 372938 sequences. (Running on oeis4.)