A328466 Row 3 of A328464: a(n) = A276156(8n - 4) / 6.

1, 6, 36, 41, 386, 391, 421, 426, 5006, 5011, 5041, 5046, 5391, 5396, 5426, 5431, 85086, 85091, 85121, 85126, 85471, 85476, 85506, 85511, 90091, 90096, 90126, 90131, 90476, 90481, 90511, 90516, 1616616, 1616621, 1616651, 1616656, 1617001, 1617006, 1617036, 1617041, 1621621, 1621626, 1621656, 1621661, 1622006, 1622011

Offset: 1

Author

Antti Karttunen, Oct 18 2019

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..8192
• Index entries for sequences related to primorial base

Crossrefs

Row 3 of A328464.

Cf. A002110, A276156, A328461.

Programs

PARI

A002110(n) = prod(i=1,n,prime(i));
A276156(n) = { my(p=2,pr=1,s=0); while(n,if(n%2,s += pr); n >>= 1; pr *= p; p = nextprime(1+p)); (s); };
A328466(n) = (A276156((8*n)-4) / 6);

Formula

a(n) = (1/6) * A276156(8*n - 4).