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Search: id:A064115
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| A064115 |
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Numbers n such that n and n+1 have same sum of non-unitary divisors (A048146), for A048146(n) > 0. |
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+0
2
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| 188, 1484, 3915, 14750, 19196, 20150, 79947, 164996, 190484, 219375, 253827, 639387, 718011, 835515, 1172374, 1380483, 2026323, 2064249, 3611708, 5507540, 6128108, 6374403, 6872984
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The sequence snud(A064115(n))=snud(1+A064115(n)) is A103846(n). - Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 17 2005
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,30
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EXAMPLE
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snud(1484) = 864, snud(1485) = 864.
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PROGRAM
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(PARI) snud(n)= { sumdiv(n, d, if(gcd(d, n/d)!=1, d)) } { n=0; for (m=1, 10^9, s=snud(m); if (s>0 && s==snud(m + 1), write("b064115.txt", n++, " ", m); if (n==30, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 07 2009]
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CROSSREFS
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Cf. A103846.
Sequence in context: A044998 A099945 A073586 this_sequence A089273 A035832 A065612
Adjacent sequences: A064112 A064113 A064114 this_sequence A064116 A064117 A064118
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Sep 09 2001
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 17 2005
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