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A217142 Least number m such that phi(m) = phi(m+6n) and m is not divisible by n. 1
143, 52, 101, 124, 104, 123, 183, 156, 248, 144, 208, 267, 241, 365, 219, 248, 312, 306, 496, 369, 288, 432, 241, 543, 369, 468, 482, 386, 730, 444, 438, 432, 496, 1220, 624, 779, 612, 801, 915, 744, 723, 582, 576, 1095, 864, 488, 482, 641, 1086, 674, 738 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Donovan Johnson, Table of n, a(n) for n = 2..1000

PROG

(PARI) fpr(Nmax, lim) = {for (i=2, Nmax, N = i*6; op = vector(N); f = 0; for (n=1, lim, if (op[n%N+1]+0==op[n%N+1]=eulerphi(n), if ((n-N) % i != 0, f = n-N; break; ); ); ); print1(f, ", "); ); }

CROSSREFS

Cf. A000010, A179188, A217068, A217139, A217141.

Sequence in context: A235457 A200557 A077494 * A306090 A296887 A293755

Adjacent sequences:  A217139 A217140 A217141 * A217143 A217144 A217145

KEYWORD

nonn

AUTHOR

Michel Marcus, Sep 27 2012

STATUS

approved

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Last modified November 19 18:39 EST 2019. Contains 329323 sequences. (Running on oeis4.)