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A080172
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Final digit of Mersenne primes (primes of the form 2^p - 1 where p is prime).
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5
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3, 7, 1, 7, 1, 1, 7, 7, 1, 1, 7, 7, 1, 7, 7, 7, 1, 1, 1, 7, 1, 1, 1, 1, 1, 1, 1, 7, 7, 1, 7, 7, 1, 7, 1, 1, 1, 1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Distribution of final digit for Mersenne primes appears (naturally) to be different from distribution for regular primes. Unconfirmed 39th digit in sequence is 1 (awaiting confirmation of 39th Mersenne prime).
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REFERENCES
| G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers. 3rd ed., Oxford Univ. Press, 1954, p. 16.
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LINKS
| Great Internet Mersenne Prime Search (GIMPS), Distributed Computing Projects
Mersenne Primes, History, Theorems and Lists
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MAPLE
| (Maple code from N. J. A. Sloane (njas(AT)research.att.com)) # let s1 := list of terms in A000043
f:=n->if n mod 4 = 0 then 4 else n mod 4; fi; map(x->2^f(x)-1, s1);
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CROSSREFS
| Cf. A000668, A007652, A080173.
Sequence in context: A010781 A019806 A199589 * A133065 A021733 A021273
Adjacent sequences: A080169 A080170 A080171 * A080173 A080174 A080175
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KEYWORD
| base,nonn
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AUTHOR
| Mark Dowdeswell (mark(AT)stats.wits.ac.za), Feb 04 2003
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EXTENSIONS
| Updated by N. J. A. Sloane (njas(AT)research.att.com), Apr 01 2008
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