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A137807 Final digit of prime(n)^2. 3
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; text; internal format)
OFFSET

1,1

COMMENTS

Euler and Sadek ask whether the sequence, interpreted as the decimal expansion N = 0.49591..., is rational or irrational. - Charles R Greathouse IV, Apr 19 2010

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, Apr 19 2010]

LINKS

Table of n, a(n) for n=1..105.

FORMULA

a(n) = A010879(A001248(n)). - R. J. Mathar, May 03 2008

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, May 03 2008

CROSSREFS

Sequence in context: A242610 A292484 A197418 * A163103 A019688 A218358

Adjacent sequences:  A137804 A137805 A137806 * A137808 A137809 A137810

KEYWORD

nonn,base

AUTHOR

Paul Curtz, Apr 29 2008

EXTENSIONS

More terms from R. J. Mathar, May 03 2008

STATUS

approved

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Last modified February 16 16:00 EST 2020. Contains 331961 sequences. (Running on oeis4.)