id:A102745 - OEIS Search Results

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Number of distinct prime factors of four consecutively concatenated primes.

+0
1

1, 3, 4, 3, 4, 3, 3, 2, 3, 2, 3, 3, 3, 4, 4, 3, 3, 4, 1, 2, 4, 3, 1, 3, 4, 3, 4, 4, 3, 2, 5, 2, 3, 1, 1, 2, 2, 2, 2, 2, 3, 5, 3, 2, 4, 4, 2, 3, 5, 4, 3, 4, 3, 5, 3, 3, 3, 2, 4, 2, 4, 3, 3, 3, 4, 4, 2, 3, 2, 3, 2, 3, 2, 4, 3, 1, 2, 4, 3, 3, 3, 4, 4, 2, 4, 3, 4, 5, 4, 4, 2, 4, 5, 4, 3, 1, 3, 3, 4, 3, 4, 1, 2, 3, 4 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`2357 is a prime, thus the number of distinct prime factors is 1.` `The number of distinct prime factors of 31374143 is 3.` `67717379 is prime, thus the number of distinct prime factors is 1.`
	MATHEMATICA	`f[n_] := Length[ FactorInteger[ FromDigits[ Flatten[ Table[ IntegerDigits[ Prime[i]], {i, n, n + 3}]] ]]]; Table[ f[n], {n, 105}] (from Robert G. Wilson v Feb 22 2005)`
	CROSSREFS	`Adjacent sequences: A102742 A102743 A102744 this_sequence A102746 A102747 A102748` `Sequence in context: A120447 A083021 A027684 this_sequence A108026 A010702 A095925`
	KEYWORD	`nonn,base`
	AUTHOR	`Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Feb 08 2005`
	EXTENSIONS	`More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 22 2005`

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Last modified October 6 12:54 EDT 2008. Contains 144667 sequences.

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