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A230765 Length of chunks of odd digits, delimited by an even digit, in the concatenation of all terms; smallest such sequence without duplicate terms. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 27 11:48 EST 2021. Contains 349385 sequences. (Running on oeis4.)