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Search: id:A097446
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| A097446 |
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Concatenate consecutive prime-sided isosceles triangles. |
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1
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| 233, 355, 577, 71111, 111313, 131717, 171919, 192323, 232929, 293131, 313737, 374141, 414343, 434747, 475353, 535959, 596161, 616767, 677171, 717373, 737979, 798383, 838989, 899797, 97101101, 101103103, 103107107, 107109109, 109113113
(list; graph; listen)
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OFFSET
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2,1
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FORMULA
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Consider triangles with sides (2, 3, 3), (3, 5, 5), .., (x, y, y) where x is prime and y is the next prime after x. Concatenate these sides for output.
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EXAMPLE
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For side x = 7, y = 11 to get concatenate 71111.
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PROGRAM
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(PARI) f(n) = for(x=1, n, y=Str(prime(x)); y=concat(y, concat(Str(prime(x+1)), Str(prime (x+1)))); print1(y", "))
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CROSSREFS
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Adjacent sequences: A097443 A097444 A097445 this_sequence A097447 A097448 A097449
Sequence in context: A127340 A105981 A087862 this_sequence A097447 A023338 A108820
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KEYWORD
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nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Aug 23 2004
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