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A109612 Numbers n such that the string 44n is prime. 0
3, 9, 21, 23, 41, 47, 51, 57, 63, 81, 83, 93, 101, 111, 119, 123, 129, 131, 159, 171, 179, 189, 201, 203, 207, 221, 249, 257, 263, 267, 269, 273, 279, 281, 293, 351, 357, 371, 381, 383, 389, 417, 449, 453, 483, 491, 497, 501, 507, 519, 531, 533, 537, 543, 549 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

If n=3 then 44n = 443 which is a prime.

If n=81 then 44n = 4481 which is a prime.

CROSSREFS

Sequence in context: A197403 A128127 A006077 * A032668 A050839 A032640

Adjacent sequences:  A109609 A109610 A109611 * A109613 A109614 A109615

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi, Aug 30 2005

EXTENSIONS

More terms from Vincenzo Librandi, Mar 27 2010

STATUS

approved

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Last modified May 22 08:07 EDT 2013. Contains 225512 sequences.