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A116260 n times n+4 gives the concatenation of two numbers m and m-4. 6
9, 99, 999, 9999, 99999, 999999, 9999999, 99999999, 999999999, 9999999999, 36363636362, 45454545453, 54545454544, 63636363635, 72727272726, 81818181817, 90909090908, 99999999999, 999999999999, 9999999999999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

99999999 * 100000003 = 100000001//99999997, where // denotes concatenation.

CROSSREFS

Cf. A116129, A116254, A116259, A116261, A116267.

Sequence in context: A261512 A242809 A108908 * A103456 A002283 A155157

Adjacent sequences:  A116257 A116258 A116259 * A116261 A116262 A116263

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified September 21 01:52 EDT 2020. Contains 337266 sequences. (Running on oeis4.)