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Search: id:A117048
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| A117048 |
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Prime numbers which are expressible as the sum of two triangular numbers. |
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+0
6
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| 2, 7, 11, 13, 29, 31, 37, 43, 61, 67, 73, 79, 83, 97, 101, 127, 137, 139, 151, 157, 163, 181, 191, 193, 199, 211, 227, 241, 263, 277, 281, 307, 331, 353, 367, 373, 379, 389, 409, 421, 433, 443, 461, 463, 487, 499, 541, 571, 577, 587, 601, 619, 631, 659, 661
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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2 = 1 + 1
7 = 1 + 6
11 = 1 + 10
13 = 10 + 3, etc.
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MATHEMATICA
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Select[ Union[Plus @@@ Tuples[ Table[n(n + 1)/2, {n, 40}], 2]], PrimeQ@# &] (* Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 02 2006 *)
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CROSSREFS
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Cf. A000040, A000217, A002243, A002244, A020756, A053614, A060773, A002636.
Sequence in context: A045369 A157975 A045370 this_sequence A040128 A140548 A018308
Adjacent sequences: A117045 A117046 A117047 this_sequence A117049 A117050 A117051
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KEYWORD
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easy,nonn
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AUTHOR
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Andrew Plewe (aplewe(AT)sbcglobal.net), Apr 15 2006
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