A036539 - OEIS

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A036539

a(n) enumerates integers of binary order n (i.e. those between 2^(n-1) and 2^n, see A029837) which have number of divisors a power of 2.

1, 1, 4, 5, 11, 22, 44, 89, 178, 351, 702, 1413, 2817, 5634, 11273, 22542, 45077 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	COMMENTS	`Increase is exponential with factor near 2.`
	EXAMPLE	`In binary order zone g[ x ]=5 the following 11 numbers have number of divisors which are powers of 2:17,19,21,22,23,24,26,27,29,30,31 with 2,2,4,4,2,8,4,4,2,8,2 divisors resp.`
	CROSSREFS	`A037992.` `Sequence in context: A077238 A185507 A000286 * A000769 A050831 A056799` `Adjacent sequences: A036536 A036537 A036538 * A036540 A036541 A036542`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified February 15 16:56 EST 2012. Contains 205825 sequences.