A393544 The first of exactly n consecutive even numbers that are totient numbers (A002202).

36, 64, 28, 78, 16, 2, 100, 3925955867002

Offset

1,1

Comments

a(9) > 10^13. The first seven terms are the first terms of A333024 and A394635-A394640.

Links

Table of n, a(n) for n=1..8.

Example

The two even numbers 64 and 66 are totient numbers but 62 and 68 are not, so a(2) = 64.

Crossrefs

Cf. A000010, A002202, A333024, A394635, A394636, A394637, A394638, A394639, A394640.

Sequence in context: A043242 A044022 A337862 * A082295 A343293 A326666

Adjacent sequences: A393541 A393542 A393543 * A393545 A393546 A393547

Keyword

nonn,more,hard

Author

Jud McCranie, Mar 26 2026

Status

approved