A167523 - OEIS

A167523

Positions of zero digits in A167503 (when all terms are concatenated).

4, 8, 12, 13, 15, 18, 30, 33, 37, 46, 54, 55, 56, 58, 59, 62, 63, 66, 70, 74, 78, 83, 84, 87, 92, 104, 115, 116, 119, 124, 136, 146, 148, 150, 152, 154, 159, 163, 176, 183, 184, 187, 192, 210, 211, 212, 213, 215, 216, 217, 220, 221, 225, 226, 230, 231, 235, 236, 240

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Also, positive integers not occurring in A167503 (bearing in mind that the terms of A167503 are written in base 3, but here numbers are written in base 10).

LINKS

Table of n, a(n) for n=1..59.

EXAMPLE

Sequence A167503: 1,2,10,12,20,21,100,101

Digit's position: 1 2 34 56 78 9A BCD EFG (A=10,...)

Thus the digits '0' occur at positions 4,8,12,13,15,...: this sequence.

PROG

(PARI) base(n, b=3, s=1) = { my( a=[ n%b ]); while( 0<n\=b, a=concat( n%b, a )); if( s, eval( Strchr( vectorsmall( #a, i, 48+a[i] ))), a) }

{a=b=[]; for(n=1, 99, #b>=n && for(i=a[n-1]+1, #b, b[i] && (a=concat(a, i)) && break); #a<n && a=concat(a, #b+1); b=concat(b, base(a[n], 3, 0))); for(i=1, #b, b[i] || print1(i", "))}

CROSSREFS

Cf. A167500-A167503.

Sequence in context: A147646 A080229 A284510 * A261811 A311077 A101887

Adjacent sequences: A167520 A167521 A167522 * A167524 A167525 A167526

KEYWORD

nonn,base

AUTHOR

M. F. Hasler, Nov 05 2009

EXTENSIONS

Edited by Charles R Greathouse IV, Aug 02 2010

STATUS

approved