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.

A369182 Numbers k such that d(k) is greater than d(k-2), d(k-1), d(k+1) and d(k+2) where d(k) is the number of divisors of k.

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%I A369182 #39 Nov 15 2024 09:03:48
%S A369182 12,24,30,36,48,60,66,72,80,84,90,96,100,108,112,120,126,132,140,144,
%T A369182 150,156,160,165,168,176,180,192,204,210,216,220,224,228,234,240,252,
%U A369182 256,260,264,270,276,280,288,294,300,312,315,320,324,330,336,357,360,364,368,372
%N A369182 Numbers k such that d(k) is greater than d(k-2), d(k-1), d(k+1) and d(k+2) where d(k) is the number of divisors of k.
%e A369182 30 is a term since d(28) = 6, d(29) = 2, d(30) = 8, d(31) = 2, d(32) = 6 and 6 < 8 > 6, 2 < 8 > 2.
%t A369182 SequencePosition[Table[DivisorSigma[0, n], {n, 1, 400}], {a_, b_, c_, d_, e_} /; Max[a, b, d, e] < c][[;; , 1]] + 2 (* _Amiram Eldar_, Jan 16 2024 *)
%Y A369182 Cf. A000005.
%Y A369182 Subsequence of A075027.
%K A369182 nonn
%O A369182 1,1
%A A369182 _Zhicheng Wei_, Jan 15 2024