A328465 Row 2 of A328464: a(n) = A276156(4n - 2) / 2.

1, 4, 16, 19, 106, 109, 121, 124, 1156, 1159, 1171, 1174, 1261, 1264, 1276, 1279, 15016, 15019, 15031, 15034, 15121, 15124, 15136, 15139, 16171, 16174, 16186, 16189, 16276, 16279, 16291, 16294, 255256, 255259, 255271, 255274, 255361, 255364, 255376, 255379, 256411, 256414, 256426, 256429, 256516, 256519, 256531

Offset

1,2

Links

Antti Karttunen, Table of n, a(n) for n = 1..8192

Index entries for sequences related to primorial base

Formula

a(n) = (1/2) * A276156(4*n - 2).

Prog

(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); };
A328465(n) = (A276156((4*n)-2) / 2);

Crossrefs

Row 2 of A328464.

Cf. A002110, A276156, A328461, A328462, A328466, A328467, A328468.

Sequence in context: A146510 A232524 A032827 * A280844 A277887 A216033

Adjacent sequences: A328462 A328463 A328464 * A328466 A328467 A328468

Keyword

nonn

Author

Antti Karttunen, Oct 18 2019

Status

approved