Search: id:A070028
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%I A070028
%S A070028 2,3,5,7,11,113,131,311,11111111111111111111111
%N A070028 Absolute primes: primes whose initial, all intermediate and final sums 
               of digits are primes.
%C A070028 The next terms are R(317) and R(1031) where R(n)=(10^n-1)/9 is a repunit 
               prime. This sequence is a subsequence of A003459 and A070027.
%e A070028 113 is a term because 113 and permutations 131 and 311 are prime as is 
               1+1+3=5. 11111111111111111111111 is a term because it is prime, all 
               permutations of its digits are prime, the sum of its digits, 23, 
               is prime and 2+3=5 is also prime.
%Y A070028 Cf. A003459 (absolute primes), A004022 (repunit primes), A070027.
%Y A070028 Sequence in context: A033938 A069598 A049575 this_sequence A084836 A062351 
               A088249
%Y A070028 Adjacent sequences: A070025 A070026 A070027 this_sequence A070029 A070030 
               A070031
%K A070028 base,nonn
%O A070028 1,1
%A A070028 Rick L. Shepherd (rshepherd2(AT)hotmail.com), Apr 15 2002

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