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A126813 Ramanujan numbers (A000594) read mod 8. 2
1, 0, 4, 0, 6, 0, 0, 0, 5, 0, 4, 0, 6, 0, 0, 0, 2, 0, 4, 0, 0, 0, 0, 0, 7, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 2, 0, 4, 0, 6, 0, 0, 0, 1, 0, 0, 0, 6, 0, 0, 0, 0, 0, 4, 0, 6, 0, 0, 0, 4, 0, 4, 0, 0, 0, 0, 0, 2, 0, 4, 0, 0, 0, 0, 0, 1, 0, 4, 0, 4, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 4, 0, 6, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

R. P. Bambah, S. Chowla and H. Gupta, A congruence property of Ramanujan’s function tau(n), Bull. Amer. Math. Soc. 53 (1947), 766-767.

H. P. F. Swinnerton-Dyer, On l-adic representations and congruences for coefficients of modular forms, pp. 1-55 of Modular Functions of One Variable III (Antwerp 1972), Lect. Notes Math., 350, 1973.

FORMULA

For all odd n, a(n) = sigma(n) mod 8 = A105827(n). - Michel Marcus, Apr 25 2016

MATHEMATICA

Mod[RamanujanTau@ #, 8] &@ Range@ 120 (* Michael De Vlieger, Apr 25 2016 *)

PROG

(PARI) A126813(n) = (ramanujantau(n)%8); \\ Antti Karttunen, Nov 26 2017

CROSSREFS

Cf. A000594, A000203, A098108, A105827, A126812, A126814.

Sequence in context: A108174 A134530 A184365 * A056141 A246004 A103688

Adjacent sequences:  A126810 A126811 A126812 * A126814 A126815 A126816

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 25 2007

STATUS

approved

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Last modified May 23 03:10 EDT 2019. Contains 323507 sequences. (Running on oeis4.)