A392407 Indices in Recamán's sequence A005132 which are the result of a record number of subtraction steps.

4, 23, 111, 1363, 24408, 17695288, 6824557154, 7725215723631, 7725215723632, 12394845542349305, 32487681032537859566, 1067849037636462036996360431525

Offset

1,1

Comments

A393285 gives corresponding values of A005132.

a(14) > 10^612.

Links

Benjamin Chaffin, Table of n, a(n) for n = 1..13

Example

Let R(n) = n-th term of Recamán's sequence (A005132). R(108)..R(111) are 370, 261, 151, 40; so R(111)=40 is the result of three consecutive subtraction steps, and is the first such R(n). Thus a(3) = 111.

Crossrefs

Cf. A005132, A393285 (corresponding terms), A390717 (record addition indices), A393284 (record addition terms), A057165 (addition steps), A057166 (subtraction steps).

Sequence in context: A017973 A306669 A124507 * A239813 A174248 A353096

Adjacent sequences: A392404 A392405 A392406 * A392408 A392409 A392410

Keyword

nonn

Author

Benjamin Chaffin, Feb 09 2026

Status

approved