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 A167742 Primes that becomes a square when some single digit is inserted in front of its decimal expansion. 1

%I #5 Nov 21 2013 12:49:43

%S 5,29,41,61,89,241,281,401,409,521,569,601,761,809,929,1009,1289,1609,

%T 2441,2801,3001,3361,4289,4649,4969,5281,5849,6481,6569,7121,7841,

%U 8081,8209,9049,9241,9601,9929

%N Primes that becomes a square when some single digit is inserted in front of its decimal expansion.

%H Harvey P. Dale, <a href="/A167742/b167742.txt">Table of n, a(n) for n = 1..700</a>

%t sqQ[x_]:=Count[Table[FromDigits[Join[{n},IntegerDigits[x]]],{n,9}], _?(IntegerQ[Sqrt[#]]&)]>0; Select[Prime[Range[1300]],sqQ] (* _Harvey P. Dale_, Oct 24 2011 *)

%K base,nonn

%O 1,1

%A _Claudio Meller_, Nov 10 2009

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Last modified May 30 15:08 EDT 2024. Contains 372968 sequences. (Running on oeis4.)