The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A328465 Row 2 of A328464: a(n) = A276156(4n - 2) / 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Antti Karttunen, Table of n, a(n) for n = 1..8192 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 24 18:46 EDT 2021. Contains 345419 sequences. (Running on oeis4.)