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A167608 Digit sum of cousin prime pairs. 1
10, 9, 12, 15, 15, 18, 21, 27, 18, 12, 15, 15, 24, 30, 18, 21, 27, 15, 18, 27, 33, 24, 27, 27, 30, 33, 30, 24, 30, 36, 33, 33, 39, 30, 36, 39, 39, 42, 27, 33, 39, 15, 27, 30, 18, 33, 24, 18, 24, 27, 27, 36, 39, 33, 33, 39, 30, 27, 36, 42, 42, 39, 42, 48, 33, 30, 21, 18, 27, 33, 36, 27, 33, 39, 27, 36, 33, 27, 39 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Except for the first term, all the others are multiples of 3.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

Eric Weisstein's World of Mathematics, Cousin Primes

EXAMPLE

The digit sum of the cousin prime pairs 223 and 227 is: 2+2+3+2+2+7 = 18.

MATHEMATICA

cptot[n_]:=Total[Join[IntegerDigits[n], IntegerDigits[n+4]]]; cptot/@Select[ Prime[Range[500]], PrimeQ[#+4]&] (* Harvey P. Dale, Apr 27 2014 *)

CROSSREFS

Cf. A023200, A166173, A167607

Sequence in context: A231471 A063661 A154533 * A063596 A284518 A309660

Adjacent sequences:  A167605 A167606 A167607 * A167609 A167610 A167611

KEYWORD

base,nonn

AUTHOR

Parthasarathy Nambi, Nov 07 2009

STATUS

approved

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Last modified August 6 11:14 EDT 2020. Contains 336246 sequences. (Running on oeis4.)