A393700 Numbers multiplied by 2 conjecturally not occurring in A393562.

3, 7, 10, 14, 18, 21, 24, 28, 30, 34, 36, 37, 42, 44, 49, 52, 57, 58, 61, 63, 64, 70, 74, 75, 77, 78, 82, 84, 86, 88, 91, 92, 96, 98, 99, 105, 106, 110, 113, 115, 119, 120, 123, 125, 128, 129, 134, 137, 142, 144, 149, 150, 156, 157, 159, 160, 162, 165, 169, 170

Offset

1,1

Comments

Observation: All odd numbers greater than 1 occur multiple times in A393562, but among the rare occurrences of even numbers, the terms of this sequence multiplied by 2 seem to be missing. A proof or at least an explanation would be appreciated.

Links

Hugo Pfoertner, Table of n, a(n) for n = 1..500

Crossrefs

Cf. A004018, A393562, A393564, A393701.

Sequence in context: A322533 A189999 A310188 * A171983 A003231 A189460

Adjacent sequences: A393697 A393698 A393699 * A393701 A393703 A393704

Keyword

nonn

Author

Hugo Pfoertner, Feb 25 2026

Status

approved