

A118721


Chen primes for which the sum of the digits is also a Chen prime.


1



2, 3, 5, 7, 11, 23, 29, 41, 47, 67, 83, 89, 101, 113, 131, 137, 139, 157, 179, 191, 197, 199, 227, 263, 269, 281, 311, 317, 337, 353, 359, 379, 401, 409, 443, 449, 461, 467, 487, 557, 571, 577, 599, 641, 647, 683, 719, 751, 797, 809, 821, 827, 829, 863, 881
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000


EXAMPLE

29 is in the sequence because (1) it is a Chen prime and (2) the sum of its digits 2+9=11 is also a Chen prime.


MATHEMATICA

With[{ch=Select[Prime[Range[200]], PrimeOmega[#+2]<3&]}, Select[ch, MemberQ[ ch, Total[IntegerDigits[#]]]&]] (* Harvey P. Dale, May 10 2018 *)


CROSSREFS

Cf. A109611.
Sequence in context: A207294 A156658 A118723 * A094318 A019344 A229291
Adjacent sequences: A118718 A118719 A118720 * A118722 A118723 A118724


KEYWORD

base,nonn


AUTHOR

Luc Stevens (lms022(AT)yahoo.com), May 21 2006


STATUS

approved



