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%I #6 Feb 21 2019 23:07:32
%S 1711,1891,4851,9591,18721,23653,24753,27261,32131,35511,57291,64261,
%T 69751,77421,79401,81003,102831,106491,108811,114003,115921,147153,
%U 153181,155403,171991,178503,181503,191271,200661,208981,219453
%N Triangular numbers T such that T+10 is the next prime after T.
%p a := proc (n) if nextprime((1/2)*n*(n+1)) = 10+(1/2)*n*(n+1) then (1/2)*n*(n+1) else end if end proc: seq(a(n), n = 1 .. 700); # _Emeric Deutsch_, Jun 20 2007
%Y Cf. A000217, A129755.
%K nonn
%O 1,1
%A _Zak Seidov_, May 29 2007
%E More terms from _Emeric Deutsch_, Jun 20 2007
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