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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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3
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OFFSET
| 1,1
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LINKS
| Carlos Rivera, The Prime Puzzles & Problems connection.
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EXAMPLE
| 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
| Cf. A092023.
Cf. A112723, A112724.
Sequence in context: A164829 A028337 A135014 * A069261 A053608 A199239
Adjacent sequences: A092021 A092022 A092023 * A092025 A092026 A092027
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KEYWORD
| more,nonn
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AUTHOR
| Farideh Firoozbakht (mymontain(AT)yahoo.com), Feb 19 2004
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