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A082716 Plateau and depression primes of the form (10^a(n)-1)-2*(10^[ a(n)-1 ]+1) or (72*10^[ a(n)-1 ]-27)/9. +0
2
3, 5, 29, 157, 323, 353, 1213, 1285, 7985, 15193 (list; graph; listen)
OFFSET

0,1

COMMENT

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

P. De Geest, PDP Reference Table

EXAMPLE

a(n)=5 -> (10^5-1)-2*(10^4+1) = 79997.

CROSSREFS

Cf. A082697 up to A082720.

Adjacent sequences: A082713 A082714 A082715 this_sequence A082717 A082718 A082719

Sequence in context: A048637 A128551 A092330 this_sequence A086859 A100857 A100856

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), Apr 13 2003.

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.


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