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A294952
Triangle read by rows: T(n,k) is the number of n-digit numbers having a k-digit greatest prime factor.
1
9, 36, 54, 95, 470, 335, 197, 2854, 3547, 2402, 356, 13370, 31999, 25577, 18698, 579, 54250, 236147, 256465, 199403, 153156, 882, 196729, 1486448, 2386859, 1999848, 1633601, 1295633, 1272, 653419, 8615121, 19298617, 19999102, 16384481, 13828384, 11219604
OFFSET
1,1
COMMENTS
By convention, gpf(1) = 1; see A006530.
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..66
EXAMPLE
Table begins
9;
36, 54;
95, 470, 335;
197, 2854, 3547, 2402;
356, 13370, 31999, 25577, 18698;
579, 54250, 236147, 256465, 199403, 153156;
882, 196729, 1486448, 2386859, 1999848, 1633601, 1295633;
1272, 653419, 8615121, 19298617, 19999102, 16384481, 13828384, 11219604;
PROG
(PARI) row(n)=if(n<2, return([9])); my(v=vector(n)); forfactored(k=10^(n-1), 10^n-1, v[#Str(vecmax(k[2][, 1]))]++); v \\ Charles R Greathouse IV, Nov 12 2017
CROSSREFS
Cf. A006530.
First column gives A085630.
Sequence in context: A329808 A169580 A258844 * A068810 A077115 A297584
KEYWORD
nonn,base,tabl
AUTHOR
Jon E. Schoenfield, Nov 11 2017
STATUS
approved