id:A059322 - OEIS Search Results

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First differences of sequence of consecutive safe primes.

+0
2

2, 4, 12, 24, 12, 24, 24, 60, 12, 48, 36, 84, 12, 24, 84, 12, 24, 60, 24, 132, 120, 24, 24, 96, 36, 168, 96, 24, 12, 48, 72, 48, 36, 96, 204, 84, 120, 12, 24, 36, 108, 240, 12, 120, 240, 60, 24, 60, 36, 24, 96, 48, 36, 264, 156, 156, 24, 60, 84, 60, 72, 48, 12, 120, 24 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n)=A0052385(n+1)-A05385(n)`
	EXAMPLE	`Except for (5,7) and (7,11), all terms are divisible by 12, since safe primes are congruent to 5 modulo 6 except 7 and safe_prime+6 is not a safe prime. Closest safe primes differ by 12 like (11,23) or (83207,83219).`
	CROSSREFS	`Cf. A005385, A033299.` `Sequence in context: A099603 A062767 A052416 this_sequence A108720 A089822 A079352` `Adjacent sequences: A059319 A059320 A059321 this_sequence A059323 A059324 A059325`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jan 26 2001`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

AT&T Labs Research