A328737 Numbers k such that at least one of sopfr(k-1) and sopfr(k+1) is greater than or equal to 3*sopfr(k).

30, 32, 36, 40, 42, 48, 52, 54, 60, 66, 68, 70, 72, 75, 78, 80, 81, 84, 88, 90, 96, 98, 100, 102, 104, 105, 108, 110, 112, 114, 117, 126, 128, 130, 132, 135, 136, 138, 140, 143, 147, 148, 150, 152, 156, 160, 162, 164, 165, 168, 172, 174, 176, 180

Offset

1,1

Comments

k-1 or k+1 or both have sums of prime factors at least 3 times the sum of prime factors of k.

Links

Table of n, a(n) for n=1..54.

Crossrefs

Cf. A001414, A328736, A328738.

Sequence in context: A133266 A337934 A335148 * A370127 A118616 A181456

Adjacent sequences: A328734 A328735 A328736 * A328738 A328739 A328740

Keyword

nonn

Author

Robert Bilinski, Oct 26 2019

Status

approved