A030597 - OEIS

A030597

Length of n-th run of digit 2 in A030588.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 2, 2, 2

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

OFFSET

1,13

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..20000

PROG

(PARI)

up_to = 20000;

A030597list(up_to, d=2) = { my(v=vector(up_to), ds=List([]), o=1, j=1, rl=0, i=0); while(i<up_to, if(j>#ds, ds=digits(o, 6); j=1; o+=2); if(d==ds[j], rl++, if(rl, i++; v[i] = rl; rl=0)); j++); (v); };

v030597 = A030597list(up_to);

A030597(n) = v030597[n]; \\ Antti Karttunen, Dec 24 2018

CROSSREFS

Cf. A030588, A030596, A030598, A030599, A030600.

Sequence in context: A085976 A171624 A032548 * A030599 A237413 A157343

Adjacent sequences: A030594 A030595 A030596 * A030598 A030599 A030600

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

EXTENSIONS

Terms corrected (first incorrect term was at a(61)) and more terms added by Antti Karttunen, Dec 24 2018

STATUS

approved