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A082717 Numbers k such that (82*10^(k-1) + 71)/9 is a depression prime. 1
3, 247, 1141, 10395, 43881 (list; graph; refs; listen; history; text; internal format)
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, 1996-97, pp. 1-9.

LINKS

Table of n, a(n) for n=1..5.

Patrick De Geest, PDP Reference Table - 919.

Makoto Kamada, Prime numbers of the form 911...119.

Index entries for primes involving repunits.

EXAMPLE

k=3 -> (82*10^(3-1) + 71)/9 = 919.

CROSSREFS

Cf. A082697-A082720, A056264.

Sequence in context: A229690 A140163 A157573 * A157777 A318065 A124875

Adjacent sequences:  A082714 A082715 A082716 * A082718 A082719 A082720

KEYWORD

nonn,base,more

AUTHOR

Patrick De Geest, Apr 13 2003

EXTENSIONS

One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

Edited by Ray Chandler, Nov 04 2014

STATUS

approved

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Last modified September 29 10:06 EDT 2020. Contains 337428 sequences. (Running on oeis4.)