A333020 - OEIS

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A333020

Starts of runs of 3 consecutive even numbers that are all totient numbers (A002202).

2, 4, 6, 8, 16, 18, 20, 28, 40, 42, 44, 52, 54, 56, 78, 80, 100, 102, 104, 106, 108, 126, 128, 136, 160, 162, 164, 176, 196, 208, 220, 222, 224, 260, 268, 292, 328, 342, 344, 356, 378, 380, 416, 438, 440, 460, 462, 464, 476, 498, 500, 502, 504, 520, 560, 584

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

Wikipedia, Totient numbers.

EXAMPLE

2 is a term since 2, 4 and 6 are all totient numbers.

PROG

(PARI) m = 3; v = vector(m); for(k=1, m, v[k] = istotient(2*k)); for(k = m+1, 300, if(Set(v) == [1], print1(2*(k-m), ", ")); v = concat(v[2..m], istotient(2*k)))

CROSSREFS

Cf. A000010, A002202, A005277, A063512, A083533, A333019, A333021, A333022, A333023, A333024.

Sequence in context: A269332 A077569 A270140 * A325792 A325780 A283423

Adjacent sequences: A333017 A333018 A333019 * A333021 A333022 A333023

KEYWORD

nonn

AUTHOR

Amiram Eldar, Mar 05 2020

STATUS

approved