A352921 Let c(s) denote A109812(s). Suppose c(s) = 2^n - 1, and define m(n), p(n), r(n) by m(n) = c(s-1)/2^n, p(n) = c(s+1)/2^n, r(n) = max(m(n), p(n)); sequence gives p(n).

1, 2, 3, 4, 5, 7, 7, 9, 9, 11, 12, 13, 13, 15, 15, 17, 17, 19

Offset: 1

Author

David Broadhurst, Aug 17 2022 (entry created by N. J. A. Sloane, Apr 24 2022)

Keywords

• nonn
• more

Comments

The sequences m, p, r are well-defined since every number appears in A109812, and if A109812(s) = 2^n - 1, then by definition both A109812(s-1) and A109812(s+1) must be multiples of 2^n.

The sequences m, p, r are discussed in A352920.

Crossrefs

Cf. A109812, A113233, A352203, A352204, A352336, A352359, A352917-A352923.