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Search: id:A075403
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| A075403 |
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Smallest k such that the difference between the k-th triangular number and the following prime is equal to n. |
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+0
2
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| 2, 1, 5, 28, 10, 48, 13, 15, 65, 160, 58, 80, 106, 32, 162, 91, 94, 188, 70, 127, 62, 304, 201, 120, 394, 103, 141, 244, 382, 455, 301, 380, 521, 700, 625, 212, 721, 611, 681, 979, 277, 815, 1201, 1275, 569, 4588, 558, 2331, 5113, 1704, 1337, 2551, 2101
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Index of the first occurrence of n in A075402.
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PROGRAM
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(PARI) for(n=1, 100, f=0:for(k=1, 50000, if(nextprime(k*(k+1)/2)-k*(k+1)/2==n, f=k:break)):print1(f", "))
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CROSSREFS
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Cf. A075403.
Sequence in context: A144058 A013014 A012905 this_sequence A110863 A091615 A155183
Adjacent sequences: A075400 A075401 A075402 this_sequence A075404 A075405 A075406
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 23 2002
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EXTENSIONS
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Corrected and extended by Ralf Stephan (ralf(AT)ark.in-berlin.de), Mar 19 2003
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