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A097011 Remainder of sigma(n) modulo 30. 5

%I #13 Jan 10 2017 07:52:26

%S 1,3,4,7,6,12,8,15,13,18,12,28,14,24,24,1,18,9,20,12,2,6,24,0,1,12,10,

%T 26,0,12,2,3,18,24,18,1,8,0,26,0,12,6,14,24,18,12,18,4,27,3,12,8,24,0,

%U 12,0,20,0,0,18,2,6,14,7,24,24,8,6,6,24,12,15,14,24,4,20,6,18,20,6,1,6

%N Remainder of sigma(n) modulo 30.

%H Indranil Ghosh, <a href="/A097011/b097011.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = mod(A000203(n), 30).

%t Table[Mod[DivisorSigma[1, n], 30], {n, 120}] (* _Michael De Vlieger_, Jan 10 2017 *)

%o (PARI) a(n) = sigma(n) % 30; \\ _Michel Marcus_, Dec 19 2013

%Y Cf. A084301, A084303, A000203, A097012, A097013, A097014, A097015.

%K nonn

%O 1,2

%A _Labos Elemer_, Aug 19 2004

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Last modified March 28 12:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)