id:A139182 - OEIS Search Results

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Numbers n such that pi(n)=d_1!!*d_2!!*...*d_k!! where d_1 d_2 ... d_k is the decimal expansion of n.

+0
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50, 51, 125, 15405, 26205, 226700, 226701, 226710, 226711, 513090, 513091, 1351832, 8210065 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`If n is in the sequence, 10 divides n and n+1 is composite then n+1 is in the sequence.`
	EXAMPLE	`pi(8210065)=8!!2!!1!!0!!0!!6!!5!!.`
	CROSSREFS	`Cf. A066457.` `Sequence in context: A078289 A043618 A134691 this_sequence A081646 A052261 A118146` `Adjacent sequences: A139179 A139180 A139181 this_sequence A139183 A139184 A139185`
	KEYWORD	`base,more,nonn,less`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Apr 19 2008`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.