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A082700 Plateau and depression primes of the form 2*(10^a(n)-1)/3-5*(10^[ a(n)-1 ]+1) or (15*10^[ a(n)-1 ]-51)/9. +0
2
5, 13, 17, 19, 37, 53, 73, 101, 6233, 24029, 40223 (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

Makoto Kamada, Factorizations of 166...661.

EXAMPLE

a(n)=13 -> 2*(10^13-1)/3-5*(10^12+1) = 1666666666661.

CROSSREFS

Cf. A082697 up to A082720.

Adjacent sequences: A082697 A082698 A082699 this_sequence A082701 A082702 A082703

Sequence in context: A092218 A049092 A103666 this_sequence A077425 A039955 A014539

KEYWORD

nonn,base

AUTHOR

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

EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

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Last modified October 15 20:12 EDT 2008. Contains 145099 sequences.


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