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a(n) is the smallest emirp that is the first of n consecutive emirps with equal digit sum.
2

%I #9 Apr 28 2019 10:53:12

%S 13,79,15919,197837,3528871,110539181,731854429,9819391129

%N a(n) is the smallest emirp that is the first of n consecutive emirps with equal digit sum.

%C a(9) > 10^11. - _Donovan Johnson_, Nov 07 2010

%e a(3) = 15919, since 15919,15937,15973 are three consecutive emirps with digit sum 25 and this is the first occurrence of three consecutive emirps with equal digit sum.

%Y Cf. A006567, A070905, A071612, A071613.

%K base,more,nonn

%O 1,1

%A _Klaus Brockhaus_, May 27 2002

%E a(7)-a(8) from _Donovan Johnson_, Nov 07 2010