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A155139 Primes p such that both p-+3 are NotSquare-free. +0
6
47, 53, 101, 239, 347, 353, 487, 547, 647, 653, 683, 719, 853, 947, 953, 1061, 1153, 1213, 1277, 1447, 1453, 1553, 1663, 1669, 1693, 1697, 1747, 1753, 1847, 2053, 2153, 2251, 2347, 2447, 2647, 2659, 2741, 2753, 2887, 2953, 3041, 3253, 3347, 3359, 3433 (list; graph; listen)
OFFSET

1,1

COMMENT

47-3=44=2^2*11, 47+3=50=2*5^2, ...

MATHEMATICA

<<NumberTheory`NumberTheoryFunctions` lst={}; Do[p=Prime[n]; If[ !SquareFreeQ[p-3]&&!SquareFreeQ[p+3], AppendTo[lst, p]], {n, 6!}]; lst

CROSSREFS

Cf. A153213, A049282

Sequence in context: A128940 A168672 A141279 this_sequence A106279 A048581 A045140

Adjacent sequences: A155136 A155137 A155138 this_sequence A155140 A155141 A155142

KEYWORD

nonn

AUTHOR

Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 21 2009

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.


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