id:A091932 - OEIS Search Results

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A091932

Primes that remain prime when their leading digit in binary representation is replaced by 0.

+0
5

7, 11, 13, 19, 23, 29, 37, 43, 61, 67, 71, 83, 101, 107, 131, 139, 151, 157, 181, 199, 211, 229, 241, 263, 269, 293, 317, 353, 359, 383, 419, 449, 467, 479, 523, 541, 571, 601, 613, 619, 643, 661, 691, 709, 739, 751, 769, 823, 829, 859, 991, 1021, 1031 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A053645(a(n)) is prime.`
	FORMULA	`A118953(A049084(a(n))) = 1; subsequence of A065380. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 07 2006`
	EXAMPLE	`A000040(12)=37 --> '100101' --> '[1]00101' --> '[0]00101' --> '101' --> 5, therefore 37 is a term.`
	CROSSREFS	`Cf. A091931.` `Cf. A118958.` `Adjacent sequences: A091929 A091930 A091931 this_sequence A091933 A091934 A091935` `Sequence in context: A084468 A115558 A067466 this_sequence A063911 A087489 A100350`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 14 2004`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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