id:A105323 - OEIS Search Results

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Numbers of the form 41*(2*10^n+1) where (2*10^n+1)/3 is prime (n is in the sequence A096507).

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861, 8241, 82000041, 8200000041, 82000000041, 8200000000041, 8200000000000000000041, 8200000000000000000000041, 8200000000000000000000000000000000000000041 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A105323=41A093170=41(210^A096507+1)=41(210^(A056657+1)+1). If m is in the sequence then d(m)reversal(m)=sigma(m) (see A104907). So this sequence is a subsequence of A104907.`
	EXAMPLE	`861 is in the sequence because 861=41(210^1+1); (2*10^1+1)/3=7 and 7 is prime.`
	MATHEMATICA	`Do[If[PrimeQ[(210^n + 1)/3], Print[41(2*10^n + 1)]], {n, 63}]`
	CROSSREFS	`Cf. A104907, A056657, A096507, A093170.` `Sequence in context: A163304 A108822 A115749 this_sequence A097982 A064321 A082243` `Adjacent sequences: A105320 A105321 A105322 this_sequence A105324 A105325 A105326`
	KEYWORD	`nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Apr 16 2005`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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