A373410 - OEIS

A373410

Minimum of the n-th maximal antirun of nonsquarefree numbers differing by more than one.

4, 9, 25, 28, 45, 49, 50, 64, 76, 81, 99, 100, 117, 121, 125, 126, 136, 148, 153, 169, 172, 176, 189, 208, 225, 243, 244, 245, 261, 276, 280, 289, 297, 316, 325, 333, 343, 344, 351, 352, 361, 364, 369, 376, 388, 405, 424, 425, 441, 460, 476, 477, 496, 508, 513

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

The maximum is given by A068781.

An antirun of a sequence (in this case A013929) is an interval of positions at which consecutive terms differ by more than one.

Consists of 4 and all nonsquarefree numbers n such that n - 1 is also nonsquarefree.

LINKS

Table of n, a(n) for n=1..55.

Gus Wiseman, Four statistics for runs and antiruns of prime, nonprime, squarefree, and nonsquarefree numbers

FORMULA

a(1) = 4; a(n>1) = A068781(n-1) + 1.