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Search: id:A092024
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| A092024 |
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a(n) is the smallest number m such that m has n distinct prime divisors and if p is a prime divisor of m then p*m +1 is prime. |
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+0
4
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| 2, 6, 354, 210, 43860, 463980, 189583590, 6958972020, 200007607800
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Carlos Rivera, The Prime Puzzles & Problems connection.
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EXAMPLE
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a(7)=189583590 because 189583590=2*3*5*7*41*97*227, all the seven numbers 2*189583590+1, 3*189583590+1, 5*189583590+1, 7*189583590+1, 41*189583590+1, 97*189583590+1 and 227*189583590+1 are prime numbers and 189583590 is the smallest number m with such property.
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CROSSREFS
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Cf. A092023.
Cf. A112723, A112724.
Sequence in context: A164829 A028337 A135014 this_sequence A069261 A053608 A123261
Adjacent sequences: A092021 A092022 A092023 this_sequence A092025 A092026 A092027
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KEYWORD
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more,nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Feb 19 2004
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