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A137807
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Final digit of prime(n)^2.
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3
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4, 9, 5, 9, 1, 9, 9, 1, 9, 1, 1, 9, 1, 9, 9, 9, 1, 1, 9, 1, 9, 1, 9, 1, 9, 1, 9, 9, 1, 9, 9, 1, 9, 1, 1, 1, 9, 9, 9, 9, 1, 1, 1, 9, 9, 1, 1, 9, 9, 1, 9, 1, 1, 1, 9, 9, 1, 1, 9, 1, 9, 9, 9, 1, 9, 9, 1, 9, 9, 1, 9, 1, 9, 9, 1, 9, 1, 9, 1, 1, 1, 1, 1, 9, 1, 9, 1, 9, 1, 9, 9, 1, 9, 1, 1, 9, 1, 1, 9, 1, 9, 9, 9, 1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Euler and Sadek ask whether the sequence, interpreted as the decimal expansion N = 0.49591..., is rational or irrational. [From Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 19 2010]
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REFERENCES
| R. Euler and J. Sadek, A number that gives the unit digit of n^n. Journal of Recreational Mathematics, 29:3 (1998), pp. 203-204. [From Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 19 2010]
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FORMULA
| a(n)=A010879(A001248(n)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 03 2008
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MAPLE
| A001248 := proc(n) ithprime(n)^2 ; end: A010879 := proc(n) n mod 10 ; end: A137807 := proc(n) A010879(A001248(n)) ; end: seq(A137807(n), n=1..140) ; # - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 03 2008
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CROSSREFS
| Sequence in context: A200011 A200241 A197418 * A163103 A019688 A196403
Adjacent sequences: A137804 A137805 A137806 * A137808 A137809 A137810
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KEYWORD
| nonn,base
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Apr 29 2008
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 03 2008
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