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A190896 Least positive integer whose binary representation does not occur in the concatenation of the binary representations of all earlier terms. 3
1, 2, 3, 4, 8, 10, 13, 15, 16, 19, 20, 32, 35, 37, 38, 40, 49, 54, 61, 64, 67, 68, 73, 74, 79, 80, 85, 87, 93, 103, 117, 121, 127, 128, 131, 134, 136, 139, 141, 143, 148, 151, 152, 155, 156, 158, 160, 165, 166, 170, 172, 174, 182, 193, 197, 217, 218, 239, 241, 251, 256, 259, 262, 264, 267, 268 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

See the variant A118250 for comments and examples.

LINKS

Table of n, a(n) for n=0..65.

PROG

(PARI) A190896(n, show=0, a=1)={my(c=[0], S=[], L); for(k=1, n, show && print1(a", "); while( setsearch(S, binary(a++)), ); c=concat(c, binary(a)); S=[]; for(i=0, #c-L=#binary(a), c[i+1] & for(j=i+L, min(i+L+1, #c), S=setunion(S, Set(t=[vecextract(c, 2^j-2^i)]))))); a}

CROSSREFS

Cf. A190897 (concatenation of binary representations), A118248 (the same with nonnegative integers), A118250, A118252 (variants where binary representations are reversed).

Sequence in context: A121612 A061193 A180941 * A135772 A209064 A222264

Adjacent sequences:  A190893 A190894 A190895 * A190897 A190898 A190899

KEYWORD

easy,nonn,base

AUTHOR

M. F. Hasler, Dec 29 2012

STATUS

approved

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Last modified January 21 19:57 EST 2019. Contains 319350 sequences. (Running on oeis4.)