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%I #11 Jul 07 2023 11:14:41
%S 7,13,19,55,103,121,127,163,253,391,721,793,1063,1441,2719,3313,9595,
%T 13045,17863,21889,46243,49891
%N Digit sums of A092571.
%C Primes in this sequence are 7, 13, 19, 103, 127,163, ....
%H Dario Alpern, <a href="https://www.alpertron.com.ar/ECM.HTM">Factorization using the Elliptic Curve Method</a>
%F a(n) = 1 + 6*A056658(n). [_R. J. Mathar_, Sep 25 2009]
%F a(n) = A007953(A092571(n)). - _Michel Marcus_, Jul 07 2023
%e The digit sum of 6666666666666666666666666666666666666666661 is 253.
%Y Cf. A007953, A056658, A092571.
%K base,nonn,more
%O 1,1
%A _Parthasarathy Nambi_, Sep 25 2009
%E More terms from _R. J. Mathar_, Sep 25 2009