A256471 Numbers n for which there is an equal number of primes in range [prime(n)^2, prime(n)*prime(n+1)] as there are primes in range [prime(n)*prime(n+1), prime(n+1)^2].

1, 10, 14, 17, 20, 90, 110, 152, 176, 185, 193, 230, 344, 377, 391, 392, 404, 441, 442, 542, 1066, 1533, 1550, 1632, 1638, 1639, 1810, 2115, 2210, 2302, 2567, 2768, 2921, 3172, 3518, 3615, 3764, 4357, 4577, 4787, 4853, 5060, 5278, 6329

Offset

1,2

Links

Table of n, a(n) for n=1..44.

Prog

(Scheme, with Antti Karttunen's IntSeq-library)
(define A256471 (ZERO-POS 1 1 A256470))

Crossrefs

Positions of zeros in A256470.

Cf. A256472, A256473 (the corresponding primes).

Sequence in context: A116610 A289698 A153041 * A250403 A096851 A244033

Adjacent sequences: A256468 A256469 A256470 * A256472 A256473 A256474

Keyword

nonn

Author

Antti Karttunen, Mar 30 2015

Status

approved