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A070042
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At these values of n the first, 2nd, 3rd, 4th and 5th cyclotomic polynomials all give prime numbers.
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2
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1068630, 1441590, 1867950, 3429300, 4084230, 5651730, 6322890, 6770610, 7158630, 7804830, 9437760, 9624270, 13625850, 23194860, 25848840, 26588520, 28714950, 29451840, 32984430, 33650580, 36500910, 38177130, 42856590
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OFFSET
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1,1
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LINKS
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FORMULA
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C1(n)=n-1, C2(n)=n+1, C3(n)=1+n+n^2, C4(n)=1+n^2 and C5(n)=1+n+n^2+n^3+n^4 are all primes.
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EXAMPLE
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n=1068630: gives quintet of primes of first, 2nd, 3rd, 4th and 5th cyclotomic polynomials: {1068629, 1068631, 1141971145531, 1141970076901, 1304096876879617162402531}.
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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