A172987 Numbers n such that n+10 and n+100 are prime.

1, 3, 7, 9, 13, 27, 31, 37, 49, 51, 57, 63, 73, 79, 91, 93, 97, 99, 127, 129, 139, 141, 157, 163, 169, 171, 181, 183, 213, 217, 231, 247, 253, 259, 267, 273, 283, 297, 301, 321, 339, 343, 349, 357, 363, 379, 387, 391, 399, 409, 421, 423, 447, 457, 469, 477, 493, 499

Offset

1,2

Links

Jonathan Frech, Table of n, a(n) for n = 1..10000

Example

a(1)=1 because 1+10=11 and 1+100=101 are both prime.

Prog

(Magma)[n: n in [0..500]|IsPrime(n+10) and IsPrime(n+100)] // Vincenzo Librandi, Dec 04 2010

Crossrefs

Sequence in context: A174840 A032664 A166733 * A118556 A279617 A199919

Adjacent sequences: A172984 A172985 A172986 * A172988 A172989 A172990

Keyword

nonn,easy,less

Author

Juri-Stepan Gerasimov, Feb 07 2010

Extensions

Corrected and edited by Charles R Greathouse IV and Vincenzo Librandi, Mar 25 2010

Status

approved