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Search: id:A073602
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| A073602 |
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a(n) is the smallest prime different from a(k) for k < n such that sum(a(j), j=1..n) is a multiple of the n-th prime. |
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+0
1
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| 2, 7, 11, 29, 17, 103, 137, 131, 23, 149, 73, 317, 67, 181, 163, 127, 233, 487, 557, 97, 593, 367, 113, 199, 1249, 2143, 47, 617, 263, 877, 19, 1213, 349, 577, 383, 311, 643, 3, 1151, 331, 677, 2521, 397, 1153, 1381, 1601, 277, 157, 631, 433, 179, 373, 443
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Conjecture: Every prime belongs to this sequence.
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EXAMPLE
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a(5) = 17 since 2 + 7 + 11 + 29 + 17 = 66 is a multiple of 11, the fifth prime. For the smaller primes 3, 5, 13 the corresponding sums 52, 54, 62 are not multiples of 11.
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PROGRAM
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(PARI) vsearch(n, v)=local(j, s); j=1; s=matsize(v)[2]; while(j<=s&&n!=v[j], j++); j<=s {m=54; v=[]; n=1; while(n<=m, p=2; while(vsearch(p, v)||((sum(j=1, matsize(v)[2], v[j])+p)%prime(n))>0, p=nextprime(p+1)); print1(p, ", "); v=concat(v, p); n++)}
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CROSSREFS
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Sequence in context: A024857 A024481 A024591 this_sequence A057025 A055469 A123151
Adjacent sequences: A073599 A073600 A073601 this_sequence A073603 A073604 A073605
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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), Aug 04 2002
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EXTENSIONS
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Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 10 2002
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