A163508 - OEIS

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A163508

The sum of the prime factors (with repetition) of the sum of 2 successive primes.

5, 6, 7, 8, 9, 10, 10, 12, 17, 12, 21, 18, 14, 13, 14, 15, 14, 14, 28, 14, 25, 14, 47, 36, 19, 24, 17, 15, 42, 16, 48, 71, 30, 16, 17, 22, 17, 21, 26, 21, 17, 38, 17, 23, 21, 48, 40, 18, 28, 23, 65, 18, 48, 131, 24, 30, 18, 141, 39, 54, 18, 19, 108, 24, 20, 18, 171, 29, 38, 24 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	FORMULA	`a(n)=A001414(A001043(n))=sopfr(p_n+p_(n+1)), p_n is n-th prime.`
	EXAMPLE	`a(1)=5 because p_1+p_2=2+3=5, and sopfr(5)=5` `a(2)=6 because p_2+p_3=3+5==222, and sopfr(8)=2+2+2=6` `a(4)=8 because p_4+p_5=7+11=18=233 and sopfr(18)=2+3+3=8.`
	CROSSREFS	`A001043, A001414.` `Sequence in context: A002141 A114547 A169869 * A168095 A030541 A020710` `Adjacent sequences: A163505 A163506 A163507 * A163509 A163510 A163511`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Jul 29 2009`

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Last modified February 13 17:43 EST 2012. Contains 205523 sequences.