id:A052213 - OEIS Search Results

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Numbers n with prime signature(n) = prime signature(n+1).

+0
1

2, 14, 21, 33, 34, 38, 44, 57, 75, 85, 86, 93, 94, 98, 116, 118, 122, 133, 135, 141, 142, 145, 147, 158, 171, 177, 201, 202, 205, 213, 214, 217, 218, 230, 244, 253, 285, 296, 298, 301, 302, 326, 332, 334, 375, 381, 387, 393, 394, 429, 434, 445, 446, 453, 481 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`pri[ n_ ] := Sort[ Transpose[ FactorInteger[ n ] ][ [ 2 ] ] ] Select[ Range[ 2,1000 ],pri[ # ]==pri[ #+1 ]& ]`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	EXAMPLE	`14 = 2^1 7^1 and 15 = 3^1 5^1, so both have prime signature {1,1}.`
	CROSSREFS	`Sequence in context: A138047 A005237 A140578 this_sequence A086263 A073143 A066613` `Adjacent sequences: A052210 A052211 A052212 this_sequence A052214 A052215 A052216`
	KEYWORD	`easy,nonn`
	AUTHOR	`Erich Friedman (efriedma(AT)stetson.edu), Jan 29 2000`

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

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