[seqfan] Re: Primes with digits sum 2^k, A068807 and A178796

[Douglas McNeil]

> Are these two sequences related to prime chains with digit sums the same:
>
> http://oeis.org/classic/?q=id:A178796|id:A068807

I think they differ after just a few more terms:

sage: A068807[:54]
[2, 11, 13, 17, 31, 53, 71, 79, 97, 101, 103, 107, 211, 233, 251, 277,
349, 367, 431, 439, 457, 503, 521, 547, 619, 673, 691, 701, 709, 727,
853, 907, 1021, 1061, 1069, 1087, 1151, 1201, 1223, 1249, 1429, 1447,
1483, 1511, 1601, 1609, 1627, 1663, 1753, 1861, 1933, 1951, 2011,
2141]
sage: A178796[:54]
[2, 11, 13, 17, 31, 53, 71, 79, 97, 101, 103, 107, 211, 233, 251, 277,
349, 367, 431, 439, 457, 503, 521, 547, 619, 673, 691, 701, 709, 727,
853, 907, 1021, 1061, 1069, 1087, 1151, 1201, 1223, 1249, 1429, 1447,
1483, 1511, 1601, 1609, 1627, 1663, 1753, 1861, 1933, 1951, 2011,
2099]

where the factor that breaks agreement is 5.


Doug

-- 
Department of Earth Sciences
University of Hong Kong