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A056824
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Numbers of the form p^(2k+1), p prime, k >= 1.
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6
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8, 27, 32, 125, 128, 243, 343, 512, 1331, 2048, 2187, 2197, 3125, 4913, 6859, 8192, 12167, 16807, 19683, 24389, 29791, 32768, 50653, 68921, 78125, 79507, 103823, 131072, 148877, 161051, 177147, 205379, 226981, 300763, 357911, 371293, 389017
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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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Sum_{n>=1} 1/a(n) = Sum_{p prime} 1/(p*(p^2-1)) = 0.2214633713... - Amiram Eldar, Dec 23 2020
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PROG
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(PARI) list(lim)=my(v=List(apply(k->k^3, primes([2, sqrtnint(lim\1, 3)]))), t); forstep(e=5, log(lim+.5)\log(2), 2, forprime(p=2, , t=p^e; if(t>lim, break); listput(v, t))); Set(v) \\ Charles R Greathouse IV, Jan 15 2015
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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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