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Search: id:A105092
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| A105092 |
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Sum of the sides of ordered 2 prime sided prime triangles. |
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+0
1
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| 20, 62, 118, 194, 262, 346, 422, 502, 602, 658, 790, 878, 974, 1066, 1162, 1266, 1378, 1462, 1578, 1658, 1766, 1882, 2030, 2122, 2238, 2338, 2458, 2570, 2662, 2762, 2866, 2986, 3106, 3290, 3406, 3514, 3614, 3698, 3830, 3918, 4022, 4150, 4310, 4430, 4538
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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An ordered 2 prime sided prime triangle is 3 consecutive primes arranged in a triangle of the form p(3n-2) p(3n-1) p(3n ) n=1, 2, .. and sides s1 = p(3n-2) p(3n-1) s2 = p(3n-1) p(3n ) s3 = p(3n-2) p(3n )
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EXAMPLE
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The first 2 prime sided prime triangle is
2
3 5
sum of sides = (2+3) + (3+5) + (2+5) = 20 the first entry.
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PROGRAM
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(PARI) sumsidestri3x3(n) = { local(x, j, s); forstep(x=1, n, 3, s = prime(x)+prime(x+1)+prime(x+2); print1(2*s", ") ) }
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CROSSREFS
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Sequence in context: A041780 A041782 A041784 this_sequence A112144 A007248 A117431
Adjacent sequences: A105089 A105090 A105091 this_sequence A105093 A105094 A105095
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Apr 07 2005
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