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A138935
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Indices k such that A019323(k)=Phi[k](5) is prime, where Phi is a cyclotomic polynomial.
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3
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3, 7, 10, 11, 12, 13, 24, 28, 47, 48, 49, 56, 57, 88, 90, 92, 108, 110, 116, 120, 127, 134, 141, 149, 161, 181, 198, 202, 206, 236, 248, 288, 357, 384, 420, 458, 500, 530, 536, 619, 620, 694, 798, 897, 929, 981, 992, 1064, 1134, 1230, 1670, 1807, 2094, 2369
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OFFSET
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1,1
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COMMENTS
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Can there be an odd multiple of 5 in this sequence?
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LINKS
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MATHEMATICA
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Select[Range[1000], PrimeQ[Cyclotomic[#, 5]] &]
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PROG
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(PARI) for( i=1, 999, ispseudoprime( polcyclo(i, 5)) &&& print1( i", ")) /* use ...subst(polcyclo(i), x, 5)... in PARI < 2.4.2 */
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CROSSREFS
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KEYWORD
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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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