The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A338071 Values of w(k) when w(k-2), w(k-1), and w(k) are all odd, where w is A336957. 4
 3263, 7183, 11671, 16291, 16601, 20741, 23257, 28639, 37667, 33163, 38819, 43849, 51469, 52789, 48701, 50275, 63323, 65117, 67903, 67223, 79751, 72193, 71265, 79183, 80743, 74741, 106483, 90571, 94159, 104467, 108043, 135821, 109771, 112561, 119149, 149387, 116377, 137951 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See comments in A337644. It would be nice to understand what is special about these numbers. The majority of them appear to products of two distinct primes. There seems to be very little overlap with either A337646 or A338057, although 1531513 appears both here and in A337646. LINKS N. J. A. Sloane, Table of n, a(n) for n = 1..575 EXAMPLE The factorizations of the first 10 terms are: 1, (13)*(251) 2, (11)*(653) 3, (11)*(1061) 4, (11)*(1481) 5, (13)*(1277) 6, (7)*(2963) 7, (13)*(1789) 8, (13)*(2203) 9, (7)*(5381) 10, (13)*(2551) The factorizations of terms 555 through 575 are: 555, (11)*(118681) 556, (7)*(213833) 557, (7)*(213887) 558, (11)*(118901) 559, (3)*(5)*(83059) 560, (11)*(120619) 561, (13)*(98867) 562, (11)*(121021) 563, (13)*(99391) 564, (7)*(218873) 565, (11)*(121621) 566, (13)*(99571) 567, (13)*(99989) 568, (11)*(122299) 569, (13)*(122503) 570, (11)*(122533) 571, (11)*(122579) 572, (13)*(100537) 573, (7)*(221537) 574, (11)*(123427) 575, (31)*(38393) CROSSREFS Cf. A336957, A337644, A337646, A338057, A338070. Sequence in context: A135134 A137836 A251919 * A234653 A254492 A254485 Adjacent sequences: A338068 A338069 A338070 * A338072 A338073 A338074 KEYWORD nonn AUTHOR N. J. A. Sloane, Oct 19 2020 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 5 22:19 EST 2023. Contains 360087 sequences. (Running on oeis4.)