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A064554
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a(n) = Min { k | A064553(k) = n}.
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4
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1, 2, 3, 4, 7, 6, 13, 8, 9, 14, 29, 12, 37, 26, 21, 16, 53, 18, 61, 28, 39, 58, 79, 24, 49, 74, 27, 52, 107, 42, 113, 32, 87, 106, 91, 36, 151, 122, 111, 56, 173, 78, 181, 116, 63, 158, 199, 48, 169, 98, 159, 148, 239, 54, 203, 104, 183, 214, 271, 84, 281, 226, 117, 64
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| A064553(a(n)) = n and A064553(a(k)) <> k for k < a(n). For prime p, a(p)=prime(p-1), which is sequence A055003. T. D. Noe (noe(AT)sspectra.com), Dec 12 2004.
a(n) is not multiplicative because a(7*13) = a(91) = 463, but a(7)*a(13) = 13*37 = 481 and 91 is the smallest possible such n. Christian G. Bower (bowerc(AT)usa.net) May 19, 2005.
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LINKS
| T. D. Noe, Table of n, a(n) for n = 1..8000
T. D. Noe, Plot of A064554
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CROSSREFS
| Cf. A064555, A001055, A064553.
Cf. A055003 (prime(prime(n)-1)).
Sequence in context: A106446 A036467 A006875 * A162425 A175686 A054426
Adjacent sequences: A064551 A064552 A064553 * A064555 A064556 A064557
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 21 2001
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