A333022 Starts of runs of 5 consecutive even numbers that are all totient numbers (A002202).

2, 4, 16, 40, 52, 100, 102, 104, 160, 220, 460, 498, 500, 856, 880, 1276, 1480, 1660, 1804, 2200, 2236, 3016, 3160, 3460, 4516, 4780, 5500, 5920, 6040, 6196, 6820, 7240, 7636, 7696, 7720, 8536, 8620, 9196, 9460, 9880, 10456, 12916, 13756, 13960, 14416, 15640

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, 6, 8 and 10 are all totient numbers.

Prog

(PARI) m = 5; v = vector(m); for(k=1, m, v[k] = istotient(2*k)); for(k = m+1, 7500, if(Set(v) == [1], print1(2*(k-m), ", ")); v = concat(v[2..m], istotient(2*k)))

Crossrefs

Cf. A000010, A002202, A005277, A063512, A083533, A333019, A333020, A333021, A333023, A333024.

Sequence in context: A296297 A290265 A223093 * A048222 A192890 A062330

Adjacent sequences: A333019 A333020 A333021 * A333023 A333024 A333025

Keyword

nonn

Author

Amiram Eldar, Mar 05 2020

Status

approved