A056260 -id:A056260 - cp's OEIS frontend

A082714 Numbers n such that 2(10^n-1)/3+(10^(n-1)+1) or (6910^(n-1)+3)/9 is a plateau or depression prime.

5, 7, 55, 97, 455, 575, 3385, 11441, 12625, 19447, 35461, 81215, 95327

Offset: 1

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Patrick De Geest, Apr 13 2003

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Prime versus probable prime status and proofs are given in the author's table.

			7 is a term because 2*(10^7-1)/3+(10^6+1) = 7666667.

C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Patrick De Geest, PDP Reference Table - 767.
Makoto Kamada, Prime numbers of the form 766...667.
Index entries for primes involving repunits.

Cf. A082697-A082720, A056260.

35461 from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
Added two more terms from PDP table, by Patrick De Geest, Nov 04 2014
Edited by Ray Chandler, Nov 05 2014
Name clarified by Michel Marcus, Mar 27 2020

cp's OEIS Frontend

A101149 Duplicate of A056260.

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A082714 Numbers n such that 2(10^n-1)/3+(10^(n-1)+1) or (6910^(n-1)+3)/9 is a plateau or depression prime.

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cp's OEIS Frontend

A101149 Duplicate of A056260.

Views

Author

Keywords

A082714 Numbers n such that 2*(10^n-1)/3+(10^(n-1)+1) or (69*10^(n-1)+3)/9 is a plateau or depression prime.

Views

Author

Keywords

Comments

Examples

References

Links

Crossrefs

Extensions

A082714 Numbers n such that 2(10^n-1)/3+(10^(n-1)+1) or (6910^(n-1)+3)/9 is a plateau or depression prime.