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A172987 Numbers n such that n+10 and n+100 are prime. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 28 01:34 EDT 2020. Contains 334671 sequences. (Running on oeis4.)