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A073648 Middle members of prime triples {p, p+2, p+6}. 10
7, 13, 19, 43, 103, 109, 193, 229, 313, 349, 463, 643, 823, 859, 883, 1093, 1279, 1303, 1429, 1483, 1489, 1609, 1873, 1999, 2083, 2239, 2269, 2659, 2689, 3253, 3463, 3529, 3673, 3919, 4003, 4129, 4519, 4639, 4789, 4933, 4969, 5233, 5479, 5503, 5653, 6199 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Solutions of the equation (n-2)' + n' + (n+4)' = 3, where n' is the arithmetic derivative of n. [Paolo P. Lava, Nov 09 2012]

LINKS

Zak Seidov, Table of n,a(n) for n=1,2380, a(n)<2*10^6

FORMULA

a(n) = A022004(n) + 2.

MATHEMATICA

Transpose[Select[Partition[Prime[Range[850]], 3, 1], Differences[#]=={2, 4}&]][[2]]  (* Harvey P. Dale, Feb 20 2011 *)

CROSSREFS

Cf. A073649, A073650.

Cf. A098412, A098414.

Sequence in context: A249381 A040096 A181938 * A298737 A109558 A108106

Adjacent sequences:  A073645 A073646 A073647 * A073649 A073650 A073651

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Aug 09 2002

EXTENSIONS

More terms from Benoit Cloitre, Aug 13 2002

STATUS

approved

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Last modified October 22 00:52 EDT 2019. Contains 328315 sequences. (Running on oeis4.)