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A089432 Numbers n such that n concatenated with floor(n/2) is prime. 0
3, 7, 15, 19, 23, 27, 35, 39, 47, 55, 67, 75, 95, 99, 107, 119, 127, 135, 163, 179, 187, 195, 227, 235, 239, 243, 255, 267, 303, 319, 327, 347, 379, 407, 427, 443, 455, 459, 463, 479, 523, 539, 547, 555, 583, 607, 619, 635, 663, 667, 683, 687, 695, 715, 723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are odd.

LINKS

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

CROSSREFS

Cf. A054211.

Sequence in context: A143703 A098582 A235698 * A111294 A092899 A075694

Adjacent sequences:  A089429 A089430 A089431 * A089433 A089434 A089435

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Dec 28 2003

STATUS

approved

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Last modified January 24 01:05 EST 2020. Contains 331178 sequences. (Running on oeis4.)