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A154726
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Triangle read by rows in which row n lists: n, in the center of the row and the pairs of prime numbers that are equidistant to n, as shown below in the example.
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12
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1, 2, 3, 3, 4, 5, 3, 5, 7, 5, 6, 7, 3, 7, 11, 3, 5, 8, 11, 13, 5, 7, 9, 11, 13, 3, 7, 10, 13, 17, 3, 5, 11, 17, 19, 5, 7, 11, 12, 13, 17, 19, 3, 7, 13, 19, 23, 5, 11, 14, 17, 23, 7, 11, 13, 15, 17, 19, 23, 3, 13, 16, 19, 29, 3, 5, 11, 17, 23, 29
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 1..10000
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EXAMPLE
| Triangle begins:
. . . . . . . . . . . . .1
. . . . . . . . . . . . .2 ..
. . . . . . . . . . . .. 3 .. ..
. . . . . . . . . . . 3, 4, 5 .. ..
. . . . . . . . . .3, .. 5, . .7 .. ..
. . . . . . . . .. .. 5, 6, 7 .. .. .. ..
. . . . . . .3, .. .. .. 7, . .. .. 11 .. ..
. . . . . 3, .. 5, .. .. 8, .. . 11,.. 13 .. ..
. . . . . .. 5, .. 7, .. 9, . 11, . 13 .. .. .. ..
. . 3, .. .. .. 7, .. . 10, . .. 13,.. .. .. 17 .. ..
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MAPLE
| for n from 1 to 10 do for k from 1 to 2*n-1 do if(k=n or (isprime(k) and isprime(2*n-k)))then print(k):fi:od:od: # Nathaniel Johnston, Apr 18 2011
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CROSSREFS
| Cf. A000040, A154720, A154721, A154722, A154723, A154724, A154725, A154727.
Sequence in context: A110533 A131282 A114544 * A204979 A071585 A106500
Adjacent sequences: A154723 A154724 A154725 * A154727 A154728 A154729
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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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EXTENSIONS
| a(31) - a(70) from Nathaniel Johnston (nathaniel(AT)nathanieljohnston.com), Apr 18 2011
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