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A082697 Numbers k such that (4*10^(k-1) - 7)/3 is a plateau prime. 25
3, 5, 7, 95, 161, 361, 1471, 2899, 3095, 3113, 15699, 17957, 42263, 111033 (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
Patrick De Geest, PDP Reference Table - 131.
FORMULA
a(n) = A056244(n+1) + 2.
EXAMPLE
k=7 -> (4*10^(7-1) - 7)/3 = 1333331.
CROSSREFS
Sequence in context: A153138 A201270 A160360 * A051345 A242387 A104388
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Apr 13 2003
EXTENSIONS
a(13)=42263 from Patrick De Geest, Oct 03 2004
a(14)=111033 from Ray Chandler, Apr 14 2011
Edited by Ray Chandler, Nov 04 2014
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)