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Search: id:A083004
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| A083004 |
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Primes whose 10's complement is a square. |
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+0
1
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| 19, 271, 919, 991, 15319, 22159, 25471, 28711, 46639, 54631, 64279, 74719, 84871, 86311, 87679, 90199, 92431, 95239, 98479, 98911, 99559, 99991, 1125559, 1196911, 1338751, 1549351, 1653679, 1688311, 1826119, 1996759, 2064511, 2098279
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(5)=15319 because 100000-15319 = 84681 = 291^2.
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PROGRAM
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(PARI) { PTS(m)=local(ct, sr, ptc); ct=0; sr=0; forprime(p=2, m, ptc=10^length(Str(p))-p; if(issquare(ptc), ct+=1; print1(p", "); sr+=1.0/p; )); print(); print("Found "ct" primes < "m); print("Sum of reciprocals = "sr); }
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CROSSREFS
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Sequence in context: A016302 A141942 A142899 this_sequence A139739 A016189 A125476
Adjacent sequences: A083001 A083002 A083003 this_sequence A083005 A083006 A083007
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), May 30 2003
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