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A074843 Quadruplets: base 10 representation is the juxtaposition of four identical strings. 0
1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 10101010, 11111111, 12121212, 13131313, 14141414, 15151515, 16161616, 17171717, 18181818, 19191919, 20202020, 21212121, 22222222, 23232323, 24242424, 25252525 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Doublets in which the index is also a doublet. - Jamie Robert Creasey, Jun 23 2021

LINKS

Table of n, a(n) for n=1..25.

FORMULA

A020338(A020338(n)). - Jamie Robert Creasey, Jun 23 2021

PROG

(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

(PARI) a(n)=eval(Str(n, n, n, n)) \\ Charles R Greathouse IV, Jun 23 2021

CROSSREFS

Cf. A020338.

Sequence in context: A033285 A085109 A346000 * A175464 A326110 A043496

Adjacent sequences:  A074840 A074841 A074842 * A074844 A074845 A074846

KEYWORD

easy,nonn,base

AUTHOR

Felice Russo, Sep 10 2002

STATUS

approved

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Last modified September 20 18:52 EDT 2021. Contains 347588 sequences. (Running on oeis4.)