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Search: id:A064351
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| A064351 |
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Numbers n such that n and n+1 have the same sum and number of prime divisors (with repetition). |
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+0
1
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| 6867, 57075, 113283, 155708, 230124, 244035, 250995, 351075, 437715, 508563, 667628, 742508, 1065843, 1095315, 1166067, 1302092, 1379907, 1431212, 1496780, 2373452, 2519343, 2978787, 2992220, 3164524, 3583772, 4799011, 4826835
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,80
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PROGRAM
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(PARI) sopfr(n)= { local(c, f, s=0); G=0; f=factor(n); for(i=1, matsize(f)[1], c=f[i, 2]; G+=c; s+=f[i, 1]*c); return(s) } { n=c=s=0; for (m=1, 10^9, us=sopfr(m + 1); if(c==G && s==us, write("b064351.txt", n++, " ", m); if (n==100, break)); c=G; s=us ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 12 2009]
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CROSSREFS
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Cf. A001414, A001222.
Sequence in context: A013811 A013892 A154086 this_sequence A062678 A018848 A031671
Adjacent sequences: A064348 A064349 A064350 this_sequence A064352 A064353 A064354
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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), Oct 15 2001
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EXTENSIONS
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a(25) - a(27) from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 12 2009
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