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A085875 Rearrangement of natural numbers as follows: a(1) = 1, a(2) =2, a(n+1) = smallest number not included earlier such that a(n-1)*a(n) + a(n+1) is a prime. 0
1, 2, 3, 5, 4, 9, 7, 8, 11, 13, 6, 19, 17, 14, 25, 23, 12, 31, 29, 20, 21, 37, 10, 27, 41, 16, 35, 33, 26, 49, 15, 22, 43, 45, 38, 67, 47, 18, 61, 53, 24, 55, 79, 28, 39, 59, 32, 63, 65, 34, 57, 73, 40, 51, 71, 50, 81, 77, 62, 87, 83, 76, 89, 69, 56, 103, 75, 64, 109, 93, 44, 85 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..72.

CROSSREFS

Sequence in context: A119475 A096116 A259431 * A302850 A060030 A081025

Adjacent sequences:  A085872 A085873 A085874 * A085876 A085877 A085878

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Jul 07 2003

EXTENSIONS

Corrected and extended by Ray Chandler, Jul 08 2003

STATUS

approved

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Last modified November 21 16:04 EST 2019. Contains 329371 sequences. (Running on oeis4.)