

A139334


Starts with 2; has two properties: concatenation of its digits is same string as concatenation of digits of its first differences and sequence and first differences have no term in common. When there is a choice in choosing the next term in the first differences, choose the smallest number not yet present in either the sequence or its first differences.


2



2, 24, 28, 311, 312, 325, 337, 340, 365, 398, 405, 3808, 3814, 3819, 3858, 3866, 3906, 3959, 4039, 4122, 4203, 4246, 5065, 5103, 5161, 5547, 5610, 5700, 6339, 6398, 6801, 6810, 6851, 7075, 7095, 7129, 7375, 7425, 7490, 8000, 8035, 8051, 8066, 8120, 8195, 8805
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OFFSET

1,1


REFERENCES

E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 3235, Volume 59 (Jeux math'), April/June 2008, Paris.


LINKS

Lars Blomberg, Table of n, a(n) for n = 1..10000


EXAMPLE

The first differences are 22, 4, 283, 1, 13, 12, 3, 25, 33, 7, 3403, ...


CROSSREFS

Sequence in context: A258781 A064818 A022374 * A212759 A112660 A280648
Adjacent sequences: A139331 A139332 A139333 * A139335 A139336 A139337


KEYWORD

nonn,base


AUTHOR

N. J. A. Sloane (based on Angelini's article), Jun 08 2008


EXTENSIONS

Extended through a(12) by Eric Angelini, Jul 18 2008


STATUS

approved



