A357391 a(n) is the start of the least run of exactly n consecutive positive integers with strictly decreasing values of A071626, or -1 if no such run exists.

1, 64, 730, 8755, 12734, 8419585

Offset

1,2

Comments

a(n) is the least number k such that A071626(k) > A071626(k+1) > ... > A071626(k+n-1), but A071626(k-1) <= A071626(k) if k>1 and A071626(k+n-1) <= A071626(k+n).

Links

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

Example

a(2) = 64 since A071626(64) = 9 > A071626(65) = 8, and A071626(63) = A071626(66) = 9, and 64 is the least number with this property.

Crossrefs

Cf. A071626, A342091, A357389, A357390.

Sequence in context: A056573 A321817 A231305 * A108538 A195593 A221753

Adjacent sequences: A357388 A357389 A357390 * A357392 A357393 A357394

Keyword

nonn,hard,more

Author

Amiram Eldar, Sep 26 2022

Status

approved