A333024 Starts of runs of 7 consecutive even numbers that are all totient numbers (A002202).

100, 26734060, 3149734998, 12960114796, 15685683796, 24077884060, 36987943996, 38809984996, 62521251798, 76314338740, 319408651400, 408656543896, 632862412198, 662547974860, 709069253900, 821202971000, 827675084516, 850472206300, 881650576396, 1152184339800, 1251003102796, 1272136979980

Offset

1,1

Comments

3925955866996 is the start of eight consecutive even totient numbers. - Jud McCranie, Mar 25 2026

Links

Jud McCranie, Table of n, a(n) for n = 1..44

Wikipedia, Totient numbers.

Example

100 is a term since the 7 even numbers 100, 102, ... 112 are all totient numbers.

Prog

(PARI) m = 7; v = vector(m); for(k=1, m, v[k] = istotient(2*k)); for(k = m+1, 1.5e7, 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, A333022, A333023.

Sequence in context: A013855 A204576 A061890 * A126686 A279028 A282088

Adjacent sequences: A333021 A333022 A333023 * A333025 A333026 A333027

Keyword

nonn

Author

Amiram Eldar, Mar 05 2020

Extensions

a(9)-a(11) from Giovanni Resta, Mar 07 2020

a(12)-a(19) by Jud McCranie, Oct 28 2025

a(20)-a(22) by Jud McCranie, Mar 25 2026

Status

approved