This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A298169 #12 Feb 11 2018 19:38:21 %S A298169 2,7,31,61,73,271,373,521,619,983,2341,2843,3469,3559,4943,6211,7741, %T A298169 9173,12073,14869,24083,33923,40177,41611,43651,46349,47269,51031, %U A298169 53623,60719,64613,88397,91801,93089,114941,124739,126751,127249,134923,141769,145517 %N A298169 The first of three consecutive primes the sum of which is equal to the sum of three consecutive triangular numbers. %H A298169 Chai Wah Wu, <a href="/A298169/b298169.txt">Table of n, a(n) for n = 1..10000</a> (n = 1..300 from Colin Barker) %e A298169 31 is in the sequence because 7+11+13 (consecutive primes) = 31 = 6+10+15 (consecutive triangular numbers). %o A298169 (PARI) L=List(); forprime(p=2, 400000, q=nextprime(p+1); r=nextprime(q+1); t=p+q+r; if(issquare(24*t-15, &sq) && (sq-9)%6==0, listput(L, p))); Vec(L) %Y A298169 Cf. A000040, A000217, A298168. %K A298169 nonn %O A298169 1,1 %A A298169 _Colin Barker_, Jan 14 2018