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Search: id:A099084
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| A099084 |
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Numbers n such that 1.2. ... .n-1.n + 4 is a prime (dot between numbers means concatenation). |
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1
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OFFSET
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1,2
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COMMENT
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Each term is odd and next term is greater than 2500. Prime corresponding to the next term has more than 8900 digits. Number of digits of primes corresponding to the four known terms of this sequence are respectively 1,3,45 & 1881.
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EXAMPLE
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27 is in the sequence because 123456789101112131415161718192021222324252627 + 4 is a prime.
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CROSSREFS
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Cf. A099081, A099082, A099083.
Sequence in context: A118714 A089506 A062496 this_sequence A085656 A113100 A038379
Adjacent sequences: A099081 A099082 A099083 this_sequence A099085 A099086 A099087
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KEYWORD
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base,more,nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Nov 03 2004
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