A100392 Numbers k such that A006530(k-1) < A006530(k) > A006530(k+1).

3, 5, 7, 11, 13, 17, 19, 23, 26, 29, 31, 34, 37, 41, 43, 47, 49, 51, 53, 55, 59, 61, 65, 67, 69, 71, 73, 76, 79, 83, 86, 89, 94, 97, 99, 101, 103, 107, 109, 111, 113, 116, 118, 122, 127, 129, 131, 134, 137, 139, 142, 146, 149, 151, 155, 157, 161, 163, 167, 173, 179

Offset: 1

Author

Labos Elemer, Dec 14 2004

Keywords

• nonn

Comments

A006530(k) is the largest prime factor of k.

The sequence contains all odd primes.

Examples

			26 is here because the largest prime factors of 25, 26, 27 are 5, 13, 3.
		

Links

• T. D. Noe, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A006530, A100390, A100393.

Programs

Mathematica

<?(First[#]<#[[2]]>Last[#]&),{1},Heads-> False]]+ 1] (* _Harvey P. Dale, Feb 22 2014 *)

Formula

a(n) = A082417(n) + 1. - T. D. Noe, Nov 26 2007

Extensions

Edited by Don Reble, Jun 13 2007