A263391 Sierpiński numbers that have at least two covering sets.

12151397, 31210219, 45181667, 56191673, 66887071, 68468753, 69169397, 71307347, 114921271, 122311103, 133228283, 152252267, 154337567, 182479909, 185282537, 192413177, 210465533, 220192013, 226521259, 235663343, 236281883, 253282909, 275248343, 282777829

Offset: 1

Author

Arkadiusz Wesolowski, Oct 16 2015

Keywords

• nonn

Examples

			For every k >= 1, 12151397*2^k + 1 has a divisor in the set {3, 5, 7, 13, 19, 37, 73} and also in the set {3, 5, 7, 13, 19, 73, 109}. 12151397 is therefore in the sequence.
		

Links

• Wikipedia, Sierpinski number

Crossrefs

Cf. A076336, A263392.

Extensions

2 terms inserted by Arkadiusz Wesolowski, Aug 28 2016

More terms from Arkadiusz Wesolowski, Jan 09 2018