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Search: id:A059766
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| A059766 |
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Initial (unsafe) primes of Cunningham chains of first type with length exactly 6. |
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+0
7
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| 89, 63419, 127139, 405269, 810809, 1069199, 1178609, 1333889, 1598699, 1806089, 1958249, 2245319, 2606069, 2848949, 3241289, 3339989, 3784199, 3962039, 4088879, 4328459, 4444829, 4658939, 4664249, 4894889, 4897709
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Special terms of A059453. Not identical to A023330 of which 1122659,2164229,2329469,.. etc. are omitted since have exact length 7 or larger. Unsafe primes starting complete chains of length 6.
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LINKS
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Chris Caldwell's Prime Glossary, Cunningham chains.
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EXAMPLE
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89 is here because (89-1)/2=44 and 64*89+127=5759=13.143 are composites, while 89,179,359,719,1439,2879 are primes. 1122659 is not here because initiates a chain of length 7.
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CROSSREFS
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Cf. A023272, A023302, A023330, A005384, A005385, A059452-A059455, A007700, A059759, A059760, A059761, A059762, A059763, A059764, A059765, A038397, A104349, A091314, A069362, A016093, A014937, A057326.
Cf. A005602, A053176, A059500, A057331, A059688, A059690.
Sequence in context: A086695 A056568 A023330 this_sequence A033513 A128872 A073905
Adjacent sequences: A059763 A059764 A059765 this_sequence A059767 A059768 A059769
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Feb 21 2001
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EXTENSIONS
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Entry revised by njas Apr 01 2006
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