cp's OEIS Frontend

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.

A210629 Each entry is the first of four consecutive primes with equal digital sum.

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%I A210629 #10 Feb 23 2024 13:26:05
%S A210629 1442173,2288509,2660183,2805773,3830891,4137473,4951073,5216137,
%T A210629 5517173,5521819,5521891,5914591,6474119,6518173,7118519,7570273,
%U A210629 8508473,8584273,8689573,8912591,9383053,9958519,10116373,10204391,11418193,11878873,11890873,12948773,13738163,13873073,14377157,14436391,14677573,14732191
%N A210629 Each entry is the first of four consecutive primes with equal digital sum.
%C A210629 The differences between each of the 4-consecutive primes are multiples of 18. - _Harvey P. Dale_, Jul 22 2016
%e A210629 2288509 is in the sequence because 2288509, 2288527, 2288563, and 2288581 are consecutive primes and the sum of the digits of each = 34
%t A210629 Transpose[Select[Partition[Prime[Range[1000000]],4,1],Total[ IntegerDigits[#[[1]]]]==Total[IntegerDigits[#[[2]]]] == Total[ IntegerDigits[#[[3]]]]==Total[IntegerDigits[#[[4]]]]&]][[1]]
%t A210629 Transpose[Select[Partition[Prime[Range[10^6]],4,1], Differences[ Total/@ (IntegerDigits/@#)]=={0,0,0}&]][[1]] (* _Harvey P. Dale_, Jul 22 2016 *)
%Y A210629 Cf. A066540, A209663, A209396.
%K A210629 nonn,base
%O A210629 1,1
%A A210629 _Harvey P. Dale_, Mar 25 2012