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A154725
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Triangle read by rows in which row n lists 2n-1 terms: The pairs of prime numbers that are equidistant to n, with 0's inserted, as shown below in the example.
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12
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 5, 0, 0, 0, 0, 3, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 5, 0, 7, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 3, 0, 5, 0, 0, 0, 0, 0, 11, 0, 13, 0, 0, 0, 0, 0, 0, 5, 0, 7, 0, 0, 0, 11, 0, 13, 0, 0, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,12
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LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 1..10000
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EXAMPLE
| Triangle begins:
. . . . . . . . . . . . . . .0
. . . . . . . . . . . . . 0, 0, 0
. . . . . . . . . . . .0, 0, 0, 0, 0
. . . . . . . . . . 0, 0, 3, 0, 5, 0, 0
. . . . . . . . .0, 0, 3, 0, 0, 0, 7, 0, 0
. . . . . . . 0, 0, 0, 0, 5, 0, 7, 0, 0, 0, 0
. . . . . .0, 0, 3, 0, 0, 0, 0, 0, 0, 0,11, 0, 0
. . . . 0, 0, 3, 0, 5, 0, 0, 0, 0, 0,11, 0,13, 0, 0
. . .0, 0, 0, 0, 5, 0, 7, 0, 0, 0,11, 0,13, 0, 0, 0, 0
. 0, 0, 3, 0, 0, 0, 7, 0, 0, 0, 0, 0,13, 0, 0, 0,17, 0, 0
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MAPLE
| for n from 1 to 10 do for k from 1 to 2*n-1 do if(not k=n and (isprime(k) and isprime(2*n-k)))then print(k):else print(0):fi:od:od: # Nathaniel Johnston, Apr 18 2011
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CROSSREFS
| Cf. A000040, A154720, A154721, A154722, A154723, A154724, A154726, A154727.
Sequence in context: A094665 A052439 A143073 * A010816 A133089 A198954
Adjacent sequences: A154722 A154723 A154724 * A154726 A154727 A154728
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KEYWORD
| easy,nonn,tabf
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Jan 14 2009
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