

A082707


Numbers k such that (32*10^(k1)  23)/9 is a plateau prime.


1



3, 9, 141, 231, 427, 463, 727, 1975, 7231, 45861, 47305
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OFFSET

1,1


COMMENTS

Prime versus probable prime status and proofs are given in the author's table.


REFERENCES

C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 199697, pp. 19.


LINKS

Table of n, a(n) for n=1..11.
Patrick De Geest, PDP Reference Table  353.
Makoto Kamada, Prime numbers of the form 355...553.
Index entries for primes involving repunits.


FORMULA

a(n) = A056254(n) + 2.


EXAMPLE

k=9 > (32*10^(91)  23)/9 = 355555553.


CROSSREFS

Cf. A082697A082720, A056254.
Sequence in context: A288757 A289900 A235062 * A087193 A217638 A101967
Adjacent sequences: A082704 A082705 A082706 * A082708 A082709 A082710


KEYWORD

nonn,base,hard,more


AUTHOR

Patrick De Geest, Apr 13 2003


EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
Edited by Ray Chandler, Nov 05 2014


STATUS

approved



