id:A108257 - OEIS Search Results

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Numbers n such that concatenating n and the sum of factorials of the digits of n produces a prime.

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1, 13, 15, 30, 31, 91, 101, 110, 128, 133, 136, 138, 144, 152, 156, 166, 175, 193, 199, 203, 215, 230, 250, 260, 280, 281, 303, 304, 306, 307, 309, 315, 320, 330, 331, 340, 361, 391, 412, 508, 520, 550, 606, 651, 661, 681, 708, 712, 717, 730, 750, 751, 780 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`The largest prime I have found pertaining to this sequence is A109016(Fibonacci(9837)) with 2064 digits (not proved prime, only Fermat and Lucas PRP).`
	EXAMPLE	`193 is in the sequence because 1!+9!+3! = 362887 and 193362887 is prime.`
	CROSSREFS	`Cf. A061602, A109016.` `Sequence in context: A109656 A087814 A113801 this_sequence A106134 A109018 A158697` `Adjacent sequences: A108254 A108255 A108256 this_sequence A108258 A108259 A108260`
	KEYWORD	`base,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jun 18 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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