A165770 Smallest divisor of 123...n (=A007908) larger than the preceding term.

1, 2, 3, 617, 823, 1286, 9721, 14593, 32463, 1234567891, 1417414341, 2110805449, 98220894641, 205761315168520219, 8230452606740808761, 3086419727527803285379, 8755800645468945490437, 70708355728013820970883

Offset: 1

Author

M. F. Hasler, Sep 30 2009

Keywords

• nonn
• base

Comments

Inspired by Layman's comment on a sequence from Angelini, cf. link.

Links

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

Crossrefs

Cf. A151995.

Programs

PARI

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

Extensions

Edited by Charles R Greathouse IV, Apr 24 2010