id:A133809 - OEIS Search Results

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Numbers that are primally tight, have 2 as first prime and strictly ascending powers.

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3

1, 2, 4, 8, 16, 18, 32, 54, 64, 108, 128, 162, 256, 324, 486, 512, 648, 972, 1024, 1458, 1944, 2048, 2250, 2916, 3888, 4096, 4374, 5832, 8192, 8748, 11250, 11664, 13122, 16384, 17496, 23328, 26244, 32768, 33750, 34992, 39366, 52488, 56250, 65536 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`All numbers of the form 2^k1p_2^k2...*p_n^k_n, where k1 < k2 < ... < k_n, and the p_i are the n first primes.` `Subset of A073491, A133811 and A133808.` `Null`
	CROSSREFS	`Cf. A025487, A087980, A073491, A133808-A133813.` `Sequence in context: A072462 A088827 A076057 this_sequence A128700 A018547 A018383` `Adjacent sequences: A133806 A133807 A133808 this_sequence A133810 A133811 A133812`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com), Sep 23, 2007`

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Last modified December 4 21:35 EST 2008. Contains 151309 sequences.

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