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A084039 a(1) = 1; then distinct numbers such that both the product of two successive terms + 1 and the ratio of the larger to the smaller of two successive terms + 1 is a prime. 2
1, 2, 8, 32, 384, 4608, 4, 24, 48, 12, 3, 6, 72, 18, 9, 54, 27, 108, 1296, 648, 324, 162, 2916, 34992, 979776, 7, 28, 112, 448, 8064, 1344, 224, 14, 252, 63, 756, 21, 42, 84, 504, 1008, 12096, 96, 192, 768, 1536, 9216, 16, 480, 30, 5, 20, 80, 320, 5760, 10, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(k+1) is either a multiple or a divisor of a(k).
LINKS
EXAMPLE
8 follows 2 as both 2*8 + 1 = 17 and 8/2 + 1 = 5 are primes.
CROSSREFS
Sequence in context: A139014 A063505 A085466 * A135620 A134708 A294530
KEYWORD
nonn
AUTHOR
Amarnath Murthy, May 26 2003
EXTENSIONS
Corrected and extended by Ray Chandler, Aug 05 2003
STATUS
approved

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Last modified July 19 04:51 EDT 2024. Contains 374388 sequences. (Running on oeis4.)