A328241 Numbers n for which A327860(n) = A003415(A276086(n)) is not a squarefree number.

0, 8, 13, 16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 36, 44, 45, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 64, 70, 72, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121

Offset: 1

Author

Antti Karttunen, Oct 10 2019

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..20000
• Index entries for sequences related to primorial base

Crossrefs

Cf. A003415, A008966, A276086, A327860.

Cf. A328242 (complement).

Programs

PARI

A327860(n) = { my(m=1, i=0, s=0, pr=1, nextpr); while((n>0), i=i+1; nextpr = prime(i)*pr; if((n%nextpr), my(e=((n%nextpr)/pr)); m *= (prime(i)^e); s += (e / prime(i)); n-=(n%nextpr)); pr=nextpr); (s*m); };
isA328241(n) = !issquarefree(A327860(n));