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A154767
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Primes with even largest digit.
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2
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2, 41, 43, 61, 83, 163, 181, 211, 241, 263, 281, 283, 383, 401, 421, 431, 433, 443, 461, 463, 487, 563, 587, 601, 613, 631, 641, 643, 653, 661, 683, 787, 811, 821, 823, 827, 853, 857, 863, 877, 881, 883, 887, 1021, 1061, 1063, 1087, 1163, 1181, 1187, 1201
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OFFSET
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1,1
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COMMENTS
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Relative density 0 in the primes. It is natural to conjecture that there are infinitely many, but can this be proved? [From Charles R Greathouse IV, Nov 12 2010]
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LINKS
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Table of n, a(n) for n=1..51.
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MAPLE
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A054055 := proc(n) max( op(convert(n, base, 10))) ; end: isA154767 := proc(n) RETURN( isprime(n) and ( A054055(n) mod 2 ) = 0 ) ; end; for n from 1 to 400 do p := ithprime(n) ; if isA154767(p) then printf("%d, ", p) ; fi; od: [From R. J. Mathar, Jan 18 2009]
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CROSSREFS
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Sequence in context: A062769 A033841 A107194 * A042923 A222717 A059698
Adjacent sequences: A154764 A154765 A154766 * A154768 A154769 A154770
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KEYWORD
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nonn,base,changed
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AUTHOR
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Juri-Stepan Gerasimov, Jan 15 2009
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EXTENSIONS
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837 replaced by 827. R. J. Mathar, Jan 18 2009
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STATUS
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approved
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