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A276043 Least k such that n divides d(sigma(k)) (d = A000005). 0

%I

%S 1,2,3,5,33,6,105,14,22,33,651,24,2667,105,66,54,57337,88,172011,114,

%T 210,1302,2752491,120,510,5334,472,378,199753347,264

%N Least k such that n divides d(sigma(k)) (d = A000005).

%e a(5) = 33 because 5 divides A000005(A000203(33)) = 10.

%t Table[k = 1; While[! Divisible[DivisorSigma[0, #] &@ DivisorSigma[1, k], n], k++]; k, {n, 28}] (* _Michael De Vlieger_, Aug 21 2016 *)

%o (PARI) a(n) = {my(k = 1); while(numdiv(sigma(k)) % n, k++); k; }

%Y Cf. A000005, A000203, A062068.

%K nonn,more

%O 1,2

%A _Altug Alkan_, Aug 17 2016

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Last modified June 16 04:54 EDT 2019. Contains 324145 sequences. (Running on oeis4.)