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 A278139 Primes, starting with a(1)=2, whose successive differences are increasing triangular numbers. 1
 2, 3, 13, 41, 107, 227, 503, 881, 1409, 2039, 2819, 3947, 5273, 6869, 8699, 11549, 15377, 19937, 24593, 30809, 38069, 47939, 58379, 69257, 82787, 98897, 115733, 133499, 152027, 172127, 192833, 218711, 247391, 279269, 315047, 355517, 399473, 444623 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA lst={1}; p[1]=2; p[n_]:=p[n]=Module[{i=Last[lst]+1}, While[!PrimeQ[p[n-1]+i*(i-1)/2], i++]; AppendTo[lst, i]; p[n-1]+i*(i-1)/2]; p/@Range[50] CROSSREFS Cf. A088173, A275030. Sequence in context: A264042 A122719 A106866 * A280005 A235626 A164133 Adjacent sequences:  A278136 A278137 A278138 * A278140 A278141 A278142 KEYWORD easy,nonn AUTHOR Ivan N. Ianakiev, Nov 13 2016 STATUS approved

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Last modified October 15 04:33 EDT 2019. Contains 328026 sequences. (Running on oeis4.)