A230765 Length of chunks of odd digits, delimited by an even digit, in the concatenation of all terms; smallest such sequence without duplicate terms.

3, 1, 2, 4, 5, 6, 7, 9, 10, 11, 13, 8, 15, 17, 12, 19, 31, 33, 21, 35, 37, 39, 14, 51, 53, 55, 57, 16, 59, 71, 73, 75, 77, 23, 79, 91, 93, 95, 97, 18, 99, 111, 110, 113, 115, 117, 119, 112, 131, 133, 135, 137, 139, 30, 151, 153, 155, 114, 157

Offset: 1

Author

Eric Angelini and M. F. Hasler, Oct 29 2013

Keywords

• nonn
• base

Links

• E. Angelini, Cut the sequence after it's odd/even digits, SeqFan List, Oct 29 2013

Crossrefs

See A230764 for the "even" version.

Programs

PARI

A230765_vec(n, a=[], s=[],u=0)={my(check(a, s)=my(L=0, j=1); !for(i=1, #s, ( i>L+a[j] || (( i==L+a[j] )== bittest(s[i],0))) && return; bittest(s[i],0) && next; L=i; j++)); check(a, s)||return; n-- || return(a); my(t); for(k=1, 9e9, bittest(u,k)&&next; (t=A230765_vec(n, concat(a, k), concat(s, digits(k)), u+2^k))&& return(t))}