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Search: id:A153050
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| A153050 |
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Six-digit squares that are concatenation of two 3-digit primes. |
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+0
3
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| 101761, 113569, 127449, 131769, 137641, 149769, 167281, 199809, 349281, 439569, 463761, 491401, 641601, 683929, 797449
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(n)=(A153048(n))^2.
There are exactly 15 such numbers.
There are exactly 15 such numbers.
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MATHEMATICA
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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
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A153048
Sequence in context: A096929 A023077 A077760 this_sequence A106813 A106814 A074669
Adjacent sequences: A153047 A153048 A153049 this_sequence A153051 A153052 A153053
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KEYWORD
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fini,full,nonn,base
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Dec 17 2008
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