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A153050
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Six-digit squares that are concatenation of two 3-digit primes.
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2
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101761, 113569, 127449, 131769, 137641, 149769, 167281, 199809, 349281, 439569, 463761, 491401, 641601, 683929, 797449
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n)=(A153048(n))^2.
There are exactly 15 such numbers.
There are exactly 15 such numbers.
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MATHEMATICA
| c = 0; t = 1000; re = Sort[Reap[Do[If[PrimeQ[p], Do[If[PrimeQ[q], r = p*t + q; s = Sqrt[r]; If[s == Floor[s], c++; Sow[r]]], {q, 101, 999, 2}]], {p, 101, 999, 2}]][[2, 1]]]
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CROSSREFS
| A153048
Sequence in context: A187642 A023077 A077760 * A203592 A106813 A186096
Adjacent sequences: A153047 A153048 A153049 * A153051 A153052 A153053
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KEYWORD
| fini,full,nonn,base
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Dec 17 2008
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