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A089572 a(1) = 19. For n > 1, a(n) is the least unused number such that every concatenation a(n)a(n-1)...a(2)a(1) is prime. 1
19, 4, 5, 3, 7, 9, 15, 14, 1, 60, 26, 28, 6, 20, 13, 74, 30, 111, 45, 12, 16, 11, 31, 102, 144, 72, 27, 65, 33, 79, 21, 77, 147, 91, 47, 96, 37, 2, 106, 200, 46, 54, 44, 75, 141, 126, 165, 178, 63, 36, 51, 78, 210, 170, 85, 143, 183, 70, 48, 83, 225, 411, 142, 461, 270, 124 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Is this a rearrangement of the natural numbers?

LINKS

Table of n, a(n) for n=1..66.

CROSSREFS

Cf. A089710, A089711, A089560-A089573.

Sequence in context: A040349 A274249 A040350 * A040348 A128050 A185424

Adjacent sequences:  A089569 A089570 A089571 * A089573 A089574 A089575

KEYWORD

base,nonn

AUTHOR

Ray Chandler, Nov 22 2003

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 29 2010

STATUS

approved

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Last modified March 25 02:31 EDT 2019. Contains 321450 sequences. (Running on oeis4.)