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A082129
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Rounded base-2 logarithm of A082128(n+4).
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1
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3, 1, 5, 4, 6, 9, 17, 22, 33, 53, 76, 114, 171, 260, 390, 585, 874, 1311, 1970
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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PROG
| (PARI) p=21*4*5*13:for(n=1, 50, v=divisors(p):r=sqrt(p):t=0:for(k=1, matsize(v)[2], if(v[k]>=r, t=k:break)): if(v[t]^2==p, u=t, u=t-1): if(v[t]-v[u]<2, u=u-1:t=t+1):print1(round(log(v[t]-v[u])/log(2))", "):p=p*(v[t]-v[u]))
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CROSSREFS
| Cf. A082127.
Sequence in context: A154947 A152747 A010847 * A159970 A096374 A007085
Adjacent sequences: A082126 A082127 A082128 * A082130 A082131 A082132
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KEYWORD
| nonn,hard
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AUTHOR
| Ralf Stephan (ralf(AT)ark.in-berlin.de), Apr 04 2003
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