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A167742 Primes that becomes a square when some single digit is inserted in front of its decimal expansion. 1
5, 29, 41, 61, 89, 241, 281, 401, 409, 521, 569, 601, 761, 809, 929, 1009, 1289, 1609, 2441, 2801, 3001, 3361, 4289, 4649, 4969, 5281, 5849, 6481, 6569, 7121, 7841, 8081, 8209, 9049, 9241, 9601, 9929 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..700

MATHEMATICA

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 *)

CROSSREFS

Sequence in context: A087879 A091729 A033205 * A107151 A117746 A156053

Adjacent sequences:  A167739 A167740 A167741 * A167743 A167744 A167745

KEYWORD

base,nonn

AUTHOR

Claudio Meller, Nov 10 2009

STATUS

approved

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Last modified July 17 21:24 EDT 2019. Contains 325109 sequences. (Running on oeis4.)