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A063969
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sopf(n) = sopf(n+3), where sopf(n)= A008472(n).
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1
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7, 60, 147, 407, 470, 1053, 1175, 3431, 3822, 5126, 5960, 6280, 6321, 6897, 7200, 8687, 9243, 10760, 12614, 15093, 16153, 18080, 18818, 19668, 20433, 20976, 24648, 26826, 30804, 44016, 45878, 46221, 47423, 55965, 58506, 58682, 59645, 63897
(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+3), 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; for (m=1, 10^9, if(sopf(m)==sopf(m + 3), write("b063969.txt", n++, " ", m); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 04 2009]
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CROSSREFS
| Cf. A008472, A006145.
Sequence in context: A099347 A203174 A183260 * A015570 A024090 A156545
Adjacent sequences: A063966 A063967 A063968 * A063970 A063971 A063972
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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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