id:A117159 - OEIS Search Results

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Prime numbers for which the multiplicative digital root is also a prime number.

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2, 3, 5, 7, 13, 17, 31, 37, 43, 53, 71, 73, 113, 131, 137, 151, 157, 173, 211, 223, 311, 317, 359, 367, 389, 431, 557, 571, 593, 673, 751, 827, 839, 929, 953, 983, 1117, 1151, 1153, 1171, 1223, 1279, 1297, 1367, 1447, 1511, 1531, 1553, 1571, 1579, 1597, 1621 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`157 is in the sequence because it is a prime number and its multiplicative digital root 5 is also a prime number.`
	CROSSREFS	`Sequence in context: A048975 A009571 A087520 this_sequence A134873 A118724 A046732` `Adjacent sequences: A117156 A117157 A117158 this_sequence A117160 A117161 A117162`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 21 2006; corrected Apr 30 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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