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

Author

Amiram Eldar, Mar 05 2020

Keywords

• nonn

Examples

			2 is a term since 2, 4, 6, 8 and 10 are all totient numbers.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000
• Wikipedia, Totient numbers.

Crossrefs

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

Programs

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)))