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Search: id:A124877
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| 3, 15, 19, 26, 31, 129, 139, 211, 242, 246, 251, 474, 552, 558, 694, 801, 1001, 1123, 1313, 1687
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(1) = 3 since A007408(3)= 251 is the first prime number of sequence A007408,
a(2) = 15 since A007408(15) = 56154295334575853 is the second prime number of sequence A007408.
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MAPLE
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select(isprime@A007408, [$1..200]);
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PROGRAM
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(PARI) num=1; den=1; for(k=2, 2000, k3=k^3; s=(num*k3+den)/(den*k3); num=numerator(s); den=denominator(s); if(isprime(num), print1(k", "))) - Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 26 2008
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CROSSREFS
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Cf. A007408.
Sequence in context: A022381 A039570 A032644 this_sequence A111517 A083545 A097571
Adjacent sequences: A124874 A124875 A124876 this_sequence A124878 A124879 A124880
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KEYWORD
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hard,more,nonn
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AUTHOR
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M. F. Hasler (Maximilian.Hasler(AT)gmail.com), Nov 11 2006
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EXTENSIONS
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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 26 2008
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