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A063968
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sopf(n) = sopf(n+2), where sopf(n)= A008472(n).
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1
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2, 340, 845, 950, 1340, 3724, 5694, 6102, 7657, 8991, 9331, 9709, 10323, 11388, 11390, 12460, 15870, 18912, 19778, 20882, 21715, 24732, 26978, 29052, 29632, 32428, 33596, 35028, 38178, 42718, 43068, 45750, 46102, 50396, 53251, 61408
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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PROG
| (PARI) sopf(n, s, fac, i)=fac=factor(n); for(i=1, matsize(fac)[1], s=s+fac[i, 1]); return(s); j=[]; for(n=1, 100000, if(sopf(n)==sopf(n+2), j=concat(j, n))); j
(PARI) sopf(n)= { local(f, s=0); f=factor(n); for(i=1, matsize(f)[1], s+=f[i, 1]); return(s) } { n=0; r=sopf(1); s=sopf(2); for (m=1, 10^9, t=sopf(m + 2); if(r==t, write("b063968.txt", n++, " ", m); if (n==1000, break)); r=s; s=t ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 04 2009]
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CROSSREFS
| Cf. A008472, A006145.
Sequence in context: A083863 A057626 A201310 * A172136 A064501 A063831
Adjacent sequences: A063965 A063966 A063967 * A063969 A063970 A063971
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KEYWORD
| nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Sep 05 2001
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