A165771 Smallest positive integer such that a(1)+...a(n) divides 123...n (=A007908(n)).

1, 1, 1, 614, 206, 463, 8435, 4872, 17870, 1234535428, 182846450, 693391108, 96110089192, 205761216947625578, 8024691291572288542, 3078189274921062476618, 5669380917941142205058, 61952555082544875480446

Offset

1,4

Comments

Without the initial term, these are the first differences of A165770.

Links

Table of n, a(n) for n=1..18.

John W. Layman, Re: Sum divides concatenation, SeqFan list, Sep 30 2009.

Prog

(PARI) c=""; s=0; for(i=1, 19, fordiv(c=eval(Str(c, i)), d, d>s || next; print1(d-s, ", "); s=d; break))

Crossrefs

Cf. A151995, A165770, A166064.

Sequence in context: A020372 A032657 A117503 * A025329 A252608 A252615

Adjacent sequences: A165768 A165769 A165770 * A165772 A165773 A165774

Keyword

nonn,base

Author

M. F. Hasler, Sep 30 2009

Extensions

Edited by Charles R Greathouse IV, Apr 24 2010

Status

approved