

A082704


Numbers k such that (28*10^(k1) + 17)/9 is a depression prime.


2




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..9.
Patrick De Geest, PDP Reference Table  313.
Makoto Kamada, Prime numbers of the form 311...113.
Index entries for primes involving repunits.


FORMULA

a(n) = A056251(n) + 2.


EXAMPLE

k=15 > (28*10^(151) + 17)/9 = 311111111111113.


CROSSREFS

Cf. A082697A082720, A056251, A068650.
Sequence in context: A113487 A032623 A146512 * A152270 A032919 A340018
Adjacent sequences: A082701 A082702 A082703 * A082705 A082706 A082707


KEYWORD

nonn,base,more


AUTHOR

Patrick De Geest, Apr 13 2003


EXTENSIONS

Edited by Ray Chandler, Nov 04 2014


STATUS

approved



