A346996 a(n) = A022011(10^n).

11, 1071322781, 45549998561, 1388974666811, 36073412603141, 820230015839231, 16469758685735471, 308147713085128991

Offset

0,1

Comments

The terms are the (10^n)-th initial members of the prime octuplets of the form (p, p+2, p+6, p+8, p+12, p+18, p+20, p+26). Terms a(5) and a(6) were found using a program provided by Norman Luhn during an effort to find A210439(8) and A332493(8).

Asymptotically for n -> infinity, C_HL*Integral_{x=2..a(n)} 1/log(x)^8 dx = 10^n, where C_HL = 178.261954396542445395360788... is the specific Hardy-Littlewood constant for this prime constellation. The predicted approximate values using this relationship would be a(6) = 1.647755*10^16 and a(7) = 3.0824636*10^17.

Links

Table of n, a(n) for n=0..7.

Norman Luhn, Number of 8-tuplets with initial members < 10^n, (2021).

Crossrefs

Cf. A022011, A022012, A022013, A210439, A332493, A346997, A346998.

Sequence in context: A347849 A295173 A022545 * A086503 A275573 A247846

Adjacent sequences: A346993 A346994 A346995 * A346997 A346998 A346999

Keyword

nonn,hard,more

Author

Hugo Pfoertner, Aug 11 2021

Extensions

a(7) from Norman Luhn and Hugo Pfoertner, Sep 14 2021

Status

approved