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

Author

Zak Seidov, Jan 10 2015

Keywords

• nonn

Comments

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

Examples

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

Links

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

Crossrefs

Cf. A014612, A046314, A063644.

Programs

Mathematica

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

PARI

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