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Search: id:A060824
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| A060824 |
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4-wave sequence beginning with 2s. |
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+0
1
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| 2, 2, 2, 2, 4, 6, 8, 14, 18, 20, 38, 52, 60, 112, 150, 170, 320, 432, 492, 924, 1244, 1414, 2658, 3582, 4074, 7656, 10314, 11728, 22042, 29698, 33772, 63470, 85512, 97240, 182752, 246222, 279994, 526216, 708968, 806208, 1515176, 2041392, 2321386
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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Primes are the numbers >=2 which have no nontrivial divisor: a(p)=0.
Also: a(n)= A032741(n)-1, n>=2 (from number of divisors <n, called proper divisors).
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LINKS
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F. v. Lamoen, Wave sequences
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FORMULA
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a(n)=2*a(n-3)+3*a(n-6)-a(n-9)-a(n-12) - Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Jan 12 2003
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CROSSREFS
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Cf. A038197.
Adjacent sequences: A060821 A060822 A060823 this_sequence A060825 A060826 A060827
Sequence in context: A126663 A032600 A103260 this_sequence A064849 A132189 A034585
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls (jcearls(AT)cableone.net), May 01 2001
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EXTENSIONS
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More terms from Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Jan 12 2003
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