A269326 Let k be a number which is simultaneously Sierpiński and Riesel, and let P be a set of primes which cover every number of the form k*2^m + 1 and of the form k*2^m - 1 with m >= 1. Sequence shows elements of the set P which has the property that the product of its primes is as small as it is possible.

3, 5, 7, 11, 13, 17, 19, 31, 37, 41, 61, 73, 97, 109, 151, 241, 257, 331

Offset: 1

Author

Arkadiusz Wesolowski, Feb 23 2016

Keywords

• nonn
• fini
• full

Links

• Fred Cohen and J. L. Selfridge, Not every number is the sum or difference of two prime powers, Math. Comput. 29 (1975), pp. 79-81.

Crossrefs

Cf. A076335, A076336, A101036.

Programs

Magma

PrimeDivisors((2^36-1)*(2^48-1)*(2^60-1))[1..18];