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A061345
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Odd prime powers.
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8
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1, 3, 5, 7, 9, 11, 13, 17, 19, 23, 25, 27, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 79, 81, 83, 89, 97, 101, 103, 107, 109, 113, 121, 125, 127, 131, 137, 139, 149, 151, 157, 163, 167, 169, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Let a(n)=p^e, then tau(a(n)^2) = tau(p^(2*e)) = 2*e+1 = 2*(e+1)-1 = tau(2*a(n))-1 where tau=A000005. [Juri-Stepan Gerasimov, Jul 14 2011]
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FORMULA
| a(n) = A061344(n)-1.
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MATHEMATICA
| t={1}; k=0; Do[If[k==1, AppendTo[t, a1]]; k=0; Do[c=Sqrt[a^2+b^2]; If[IntegerQ[c]&&GCD[a, b, c]==1, k++; a1=a; b1=b; c1=c; ], {b, 4, a^2/2, 2}], {a, 3, 260, 2}]; t (* From Vladimir Joseph Stephan Orlovsky, Jan 29 2012 *)
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CROSSREFS
| Cf. A061346.
Sequence in context: A112372 A082916 A098903 * A080429 A050150 A062090
Adjacent sequences: A061342 A061343 A061344 * A061346 A061347 A061348
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jun 08 2001
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EXTENSIONS
| More terms from Larry Reeves (larryr(AT)acm.org), Jun 12 2001
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