A179530 Smallest of 12 consecutive numbers containing exactly n terms of A083207.

7, 1, 17, 19, 489, 116859

Offset

1,1

Comments

A179529(a(n)) = n and A179529(m) <> n for m < a(n);

SUM(A179527(k): a(n) <= k < a(n)+12) = n;

by definition the sequence is finite with at most 12 terms.

Links

Table of n, a(n) for n=1..6.

Peter Luschny, Zumkeller Numbers

Example

a(3)=17: A179529(17) = #{20,24,28} = #{A083207(3),A083207(4),A083207(5)} = 3;
a(4)=19: A179529(19) = #{20,24,28,30} = #{A083207(3),A083207(4),A083207(5),A083207(6)} = 4;
a(5)=489: A179529(489) = #{490,492,496,498,500} = #{A083207(107),A083207(108),A083207(109),A083207(110),A083207(111)} = 5.
For a(6), the six Zumkeller numbers are 116860, 116862, 116864, 116865, 116868, and 116870. [From T. D. Noe, Aug 22 2010]

Crossrefs

Cf. A179528.

Sequence in context: A317016 A348983 A013614 * A098081 A125234 A028325

Adjacent sequences: A179527 A179528 A179529 * A179531 A179532 A179533

Keyword

fini,more,nonn

Author

Reinhard Zumkeller, Jul 19 2010

Extensions

a(6) from T. D. Noe, Aug 22 2010

Status

approved