A064740 - OEIS

A064740

Smallest controlling prime when A064413(n) is computed.

2, 2, 2, 3, 3, 3, 2, 2, 5, 5, 3, 2, 7, 7, 3, 2, 2, 2, 11, 11, 3, 3, 5, 5, 7, 2, 13, 13, 3, 2, 2, 17, 17, 3, 2, 19, 19, 3, 5, 2, 2, 23, 23, 3, 2, 2, 2, 2, 7, 7, 3, 5, 5, 5, 2, 29, 29, 3, 2, 31, 31, 3, 2, 2, 2, 37, 37, 3, 3, 2, 2, 2, 41, 41, 3, 3, 7, 11, 2, 43, 43, 3, 5, 5, 5, 2, 2, 47, 47, 3, 2, 7

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OFFSET

2,1

LINKS

Michael De Vlieger, Table of n, a(n) for n = 2..10000

Michael De Vlieger, Mathematica code based on Lagarias-Rains-Sloane 2002, efficiently generates this sequence.

J. C. Lagarias, E. M. Rains and N. J. A. Sloane, The EKG sequence, Exper. Math. 11 (2002), 437-446; arXiv:math/0204011 [math.NT], 2002.

Index entries for sequences related to EKG sequence

FORMULA

a(n) = A020639(A073734(n)). - Michael De Vlieger, Dec 10 2021

CROSSREFS

Cf. A064413, A064741, A064742, A064743, A020639, A073734.