A338071 Values of w(k) when w(k-2), w(k-1), and w(k) are all odd, where w is A336957.

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

Offset: 1

Author

N. J. A. Sloane, Oct 19 2020

Keywords

• nonn

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.

Examples

			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)
		

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..575

Crossrefs

Cf. A336957, A337644, A337646, A338057, A338070.