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A133856
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Least number k>(2n-1) such that (2n-1)^k - 2 is prime, or 0 if no such number exists.
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1
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0, 4, 14, 8, 11, 22420, 78, 17, 24, 20, 25, 24, 63, 30, 42, 69, 128, 50, 119, 204, 2816, 76, 52, 288, 64, 66, 184, 153, 67, 268, 78, 210, 438, 295, 96, 74, 136, 128, 2900, 1898, 130, 92, 381, 106
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Henri Lifchitz & Renaud Lifchitz : PRP Records. Probable Primes Top 10000.
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FORMULA
| A128472(n) = (2n-1)^a(n) - 2 for n>1.
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CROSSREFS
| Cf. A128472 = smallest prime of the form (2n-1)^k - 2 for k>(2n-1), or 0 if no such number exists. Cf. A084714 = smallest prime of the form (2n-1)^k - 2, or 0 if no such number exists. Cf. A014224, A109080, A090669, A128455, A128457, A128458, A128459, A128460, A128461. Cf. A133858, A133982.
Sequence in context: A131702 A029661 A185439 * A018853 A193377 A202731
Adjacent sequences: A133853 A133854 A133855 * A133857 A133858 A133859
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KEYWORD
| more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 01 2007
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EXTENSIONS
| a(6) = 22420 was found by Rick L. Shepherd Sep 29 2009
a(21)-a(44) from Max Alekseyev (maxale(AT)gmail.com), Oct 04 2007
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