A247088 Primes sandwiched between 10-almost primes (A046314).

3885569, 5717249, 8411201, 9173249, 11039489, 13310081, 13506751, 13633759, 14616449, 15709951, 17482879, 21614849, 21988097, 24507521, 24714559, 26207551, 26720767, 28680319, 30546559, 31780351, 32995999, 33999103, 34602751, 38255489, 38531249, 38618369, 40408831, 44103041, 44278001

Offset

1,1

Comments

Primes p such that p-1 and p+1 are 10-almost primes.

Links

Zak Seidov, Table of n, a(n) for n = 1..1186

Example

3885569 - 1 = 2^9 * 7589;
3885569 + 1 = 2 * 3^6 * 5 * 13 * 41.

Mathematica

Select[Prime[Range[2678000]], PrimeOmega[#-1]==PrimeOmega[#+1]==10&] (* Harvey P. Dale, Jul 05 2019 *)

Prog

(PARI) is(n)=bigomega(n-1)==10 && bigomega(n+1)==10 && isprime(n) \\ Charles R Greathouse IV, Apr 27 2015

Crossrefs

Cf. A014612, A046314, A063644.

Sequence in context: A205421 A183592 A069375 * A204319 A251439 A256621

Adjacent sequences: A247085 A247086 A247087 * A247089 A247090 A247091

Keyword

nonn

Author

Zak Seidov, Jan 10 2015

Status

approved