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

1,1

Links

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

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

Prog

(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))}

Crossrefs

See A230764 for the "even" version.

Sequence in context: A151845 A230448 A201653 * A250306 A120577 A104695

Adjacent sequences: A230762 A230763 A230764 * A230766 A230767 A230768

Keyword

nonn,base

Author

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

Status

approved