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Search: id:A117390
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| A117390 |
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Numbers n such that 1234567890*sum(k=1,n,10^(10k-9)) + 1 is prime. |
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+0
2
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OFFSET
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1,1
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COMMENT
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The first two terms are given in the linked source in "Table 42: Ten Types of 'Rare' Prime Numbers" for entry "B. Sequential prime of the type: (1234567890)n 1", which designates that 1234567890 is concatenated n times and then 1 is appended. 1888, found by PrimeForm using recurrence mode, corresponds to an 18881-digit probable prime. There are no other terms <= 3000.
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LINKS
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R. Ondrejka, The Top Ten: a Catalogue of Primal Configurations
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CROSSREFS
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Sequence in context: A125637 A072895 A097059 this_sequence A048508 A020879 A058319
Adjacent sequences: A117387 A117388 A117389 this_sequence A117391 A117392 A117393
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KEYWORD
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bref,hard,more,nonn
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AUTHOR
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Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 03 2006
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