A321537 -id:A321537 - cp's OEIS frontend

A321538 a(n) = A321536(A321537(n)).

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 33, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 44, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 55, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 66, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 77, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 88, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 99, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 111, 11, 11, 11, 11, 11, 11, 11, 11, 0, 0, 22, 0

Offset: 0

N. J. A. Sloane, Nov 13 2018

More than the usual number of terms are shown in order to reach some interesting terms.

Fixed points correspond to 0 alongside A033023. - Rémy Sigrist, Nov 16 2018

Rémy Sigrist, Table of n, a(n) for n = 0..10000

Cf. A033023, A321536, A321537.

A base-10 analog of A318925.

Delete a digit A in n if it either forms a run of length 1 or begins a substring AwAA, where w consists of runs of length 1. - Charlie Neder, Dec 16 2018

A321536 Write n in base 10, lengthen all the runs of successive identical digits by 1.

Original entry on oeis.org

0, 11, 22, 33, 44, 55, 66, 77, 88, 99, 1100, 111, 1122, 1133, 1144, 1155, 1166, 1177, 1188, 1199, 2200, 2211, 222, 2233, 2244, 2255, 2266, 2277, 2288, 2299, 3300, 3311, 3322, 333, 3344, 3355, 3366, 3377, 3388, 3399, 4400, 4411, 4422, 4433, 444, 4455, 4466

Offset: 0

N. J. A. Sloane, Nov 13 2018

A321537(a(n)) = n. Compare A321538.

			10 -> 1100, so a(10)=1100; 11->111, so a(11)=111.

Giovanni Resta, Table of n, a(n) for n = 0..10000

A base-10 analog of A175046.

Cf. A321537, A321538.

a[n_] := FromDigits@ Flatten[ Append[ #, Last@#] & /@ Split@ IntegerDigits[ n]]; a /@ Range[0, 46] (* Giovanni Resta, Nov 13 2018 *)

a(n)={my(v=digits(n)); my(L=List()); for(i=1, #v, my(t=v[i]); if(i==1 || t<>v[i-1], listput(L,t)); listput(L,t)); fromdigits(Vec(L))} \\ Andrew Howroyd, Nov 13 2018

from re import split
def A321536(n):
    return int(''.join(d+d[0] for d in split('(0+)|(1+)|(2+)|(3+)|(4+)|(5+)|(6+)|(7+)|(8+)|(9+)',str(n)) if d != '' and d != None)) # Chai Wah Wu, Nov 13 2018

More terms from Giovanni Resta, Nov 13 2018

cp's OEIS Frontend

A321538 a(n) = A321536(A321537(n)).

Views

Author

Keywords

Comments

Links

Crossrefs

Formula

A321536 Write n in base 10, lengthen all the runs of successive identical digits by 1.

Views

Author

Keywords

Comments

Examples

Links

Crossrefs

Programs

Mathematica

PARI

Python

Extensions