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A152182 The sequence is a lattice filling using the exponential "E" constant digits base ten. 1
1, 21, 371, 8090, 102125, 1061609, 12108836, 198150335, 1929504527 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
MATHEMATICA
f[ 0 ] := 1; f[ n_Integer /; n > 0 ] := Module[ {i, cnt, m, p}, i = 0; cnt = 0; m = Table[ 0, {10^n} ]; p = Map[ FromDigits, Partition[ First[ RealDigits[ E, 10, 20*10^ n ] ], n, 1 ] ] + 1; Catch[ Map[ ( i++; If[ m[ [ # ] ] == 0, m[ [ # ] ] = 1; If[ ++cnt == 10^n, Throw[ i ] ] ]) &, p ] ] ];
Table[ f[ n ], {n, 0, 5} ]
CROSSREFS
Cf. A001113.
Sequence in context: A178351 A324360 A323001 * A036904 A218763 A181364
KEYWORD
nonn,uned,base
AUTHOR
Roger L. Bagula, Nov 28 2008, extended Nov 30 2008, Nov 30 2008
EXTENSIONS
a(6)-a(8) from Michael S. Branicky, Oct 04 2023
STATUS
approved

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Last modified March 29 04:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)