A089562 a(1) = 7. 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.

7, 1, 3, 6, 2, 21, 10, 9, 8, 37, 20, 25, 29, 72, 28, 30, 27, 23, 39, 19, 51, 32, 22, 54, 42, 35, 24, 73, 36, 120, 44, 186, 4, 26, 126, 171, 70, 33, 18, 60, 113, 99, 81, 76, 47, 108, 91, 170, 159, 49, 65, 114, 238, 185, 285, 34, 98, 312, 63, 183, 15, 205, 230, 198, 310, 524

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: A344967 A362923 A201585 * A104621 A331900 A176439

Adjacent sequences: A089559 A089560 A089561 * A089563 A089564 A089565

Keyword

base,nonn

Author

Ray Chandler, Nov 22 2003

Extensions

Edited by Charles R Greathouse IV, Apr 29 2010

Status

approved