A248379 Even terms in A247665 in order of appearance.

2, 4, 8, 14, 16, 32, 64, 128, 122, 244, 256, 512, 866, 1024, 1766, 2048, 4006, 4096, 8192, 8482, 12242, 16384, 32768, 52586, 65536, 105806, 131072

Offset: 1

Author

N. J. A. Sloane, Oct 08 2014

Keywords

• nonn
• more

Comments

What are the terms that are not powers of 2?

Examples

			Table (extracted from Russ Cox's extended table in A247665) showing index where even numbers appear, the even number, and the number of different prime factors of that term:
3 4 1
7 8 1
15 14 2
31 16 1
63 32 1
127 64 1
255 128 1
511 122 2
1023 244 2
2047 256 1
4095 512 1
8191 866 2
16383 1024 1
32767 1766 2
65535 2048 1
131071 4006 2
262143 4096 1
524287 8192 1
1048575 8482 2
2097151 12242 2
4194303 16384 1
8388607 32768 1
16777215 52586 2
33554431 65536 1
67108863 105806 2
134217727 131072 1
...
		

References

• Amarnath Murthy, Email to N. J. A. Sloane, Oct 05 2014.

Crossrefs

Cf. A247665, A248381, A248387, A248388.

Extensions

More terms from Russ Cox, Oct 11 2014