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A074843 Quadruplets: base 10 representation is the juxtaposition of four identical strings. 0

%I

%S 1111,2222,3333,4444,5555,6666,7777,8888,9999,10101010,11111111,

%T 12121212,13131313,14141414,15151515,16161616,17171717,18181818,

%U 19191919,20202020,21212121,22222222,23232323,24242424,25252525

%N Quadruplets: base 10 representation is the juxtaposition of four identical strings.

%C Doublets in which the index is also a doublet. - _Jamie Robert Creasey_, Jun 23 2021

%F A020338(A020338(n)). - _Jamie Robert Creasey_, Jun 23 2021

%o (UBASIC) 10 cls 30 for I=1 to 100 40 A=str(I) 50 C=A+A+A+A 60 B=val(cutspc(C)) 80 print B 90 next 100 end

%o (PARI) a(n)=eval(Str(n,n,n,n)) \\ _Charles R Greathouse IV_, Jun 23 2021

%Y Cf. A020338.

%K easy,nonn,base

%O 1,1

%A _Felice Russo_, Sep 10 2002

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Last modified October 22 13:49 EDT 2021. Contains 348170 sequences. (Running on oeis4.)