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A061255
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Euler transform of Euler totient function phi(n), cf. A000010.
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4
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1, 1, 2, 4, 7, 13, 21, 37, 60, 98, 157, 251, 392, 612, 943, 1439, 2187, 3293, 4930, 7330, 10839, 15935, 23315, 33933, 49170, 70914, 101861, 145713, 207638, 294796, 417061, 588019, 826351, 1157651, 1616849, 2251623, 3126775, 4330271, 5981190
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| N. J. A. Sloane, Transforms
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FORMULA
| G.f.: Product_{k=1..infinity} (1 - x^k)^(-phi(k)). a(n)=1/n*Sum_{k=1..n} a(n-k)*b(k), n>1, a(0)=1, b(k)=Sum_{d|k} d*phi(d), cf. A057660.
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CROSSREFS
| Cf. A000010, A057660, A006171, A001970, A061256, A061257.
Sequence in context: A018150 A019471 A061257 * A088111 A143823 A119983
Adjacent sequences: A061252 A061253 A061254 * A061256 A061257 A061258
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KEYWORD
| easy,nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 21 2001
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