| 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; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
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.
|
|
LINKS
|
T. D. Noe, Table of n, a(n) for n = 1..8000
T. D. Noe, Plot of A064554
|
|
CROSSREFS
|
Cf. A064555, A001055, A064553.
Cf. A055003 (prime(prime(n)-1)).
Sequence in context: A106446 A036467 A006875 this_sequence A162425 A054426 A054424
Adjacent sequences: A064551 A064552 A064553 this_sequence A064555 A064556 A064557
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 21 2001
|
|
