0,2

"Exact middle" means that the counts of digits of the pronic to the left and to the right of the digits of n are the same.

Table of n, a(n) for n=0..38.

a(22) = 192282 = 19//22//82 = A002378(438) is the smallest pronic which displays 22 in the middle.

Sequence in context: A281629 A278754 A266301 * A266606 A308003 A288057

Adjacent sequences: A163594 A163595 A163596 * A163598 A163599 A163600

nonn,base

Claudio Meller, Aug 01 2009

Keyword:base added by R. J. Mathar, Aug 11 2009

approved