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A089161 Numbers n such that 30*n+17 and 30*n+19 are twin primes. 1
0, 3, 4, 6, 7, 11, 20, 27, 28, 42, 47, 49, 53, 55, 56, 59, 62, 66, 67, 69, 74, 75, 88, 89, 105, 108, 115, 117, 118, 125, 130, 137, 138, 140, 144, 150, 151, 154, 159, 165, 180, 182, 188, 195, 206, 227, 231, 237, 243, 248, 249, 251, 258, 262, 269, 279, 284, 286, 287 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Solutions of the equation (30*n+17)'+(30*n+19)'=2, where n' is the arithmetic derivative of n. [Paolo P. Lava, Nov 15 2012]

LINKS

Table of n, a(n) for n=1..59.

EXAMPLE

30*3+17=107, 30*3+19=109, 107,109 twin primes

MAPLE

a:=proc(n) if isprime(30*n+17)=true and isprime(30*n+19)=true then n else fi end: seq(a(n), n=0..400); (Deutsch)

CROSSREFS

Sequence in context: A240208 A073906 A108797 * A060965 A153883 A033162

Adjacent sequences:  A089158 A089159 A089160 * A089162 A089163 A089164

KEYWORD

base,easy,nonn

AUTHOR

Pierre CAMI, Dec 06 2003

EXTENSIONS

More terms from Emeric Deutsch, Jun 13 2005

STATUS

approved

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Last modified March 18 17:51 EDT 2019. Contains 321292 sequences. (Running on oeis4.)