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A110572 Numbers n such that the string 555n is prime. 0
7, 11, 29, 41, 47, 79, 89, 109, 119, 143, 167, 209, 221, 251, 253, 257, 277, 287, 293, 301, 307, 337, 349, 361, 383, 391, 419, 421, 439, 461, 487, 491, 521, 523, 557, 589, 593, 637, 661, 671, 677, 683, 691, 697, 707, 739, 743, 761, 767, 823, 827, 829, 853 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..53.

EXAMPLE

If n=143 then 555n = 555143 (prime).

CROSSREFS

Sequence in context: A122560 A136338 A193867 * A023254 A129807 A045461

Adjacent sequences:  A110569 A110570 A110571 * A110573 A110574 A110575

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi, Sep 12 2005

EXTENSIONS

More terms from Vincenzo Librandi, Mar 27 2010

STATUS

approved

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Last modified February 20 20:34 EST 2020. Contains 332084 sequences. (Running on oeis4.)