A144327 Prime numbers p such that p - 1 is the fourth a-figurate number and nineteenth b-figurate number for some a and b.

191, 1217, 1559, 1901, 2243, 2927, 4637, 6689, 8741, 9767, 12161, 12503, 13187, 14897, 15581, 15923, 16607, 17291, 19001, 20369, 21737, 22079, 23447, 23789, 24473, 25841, 26183, 27551, 27893, 30971, 33023, 35759, 37811, 38153, 39521

Offset

1,1

Comments

Sequence of primes sufficient to determine the conjecture of A144326. Presumed to include many terms that cannot be Mersenne prime exponents, noting A096676: either infinitely many, or all.

These primes are very rare. There are only 10 less than 10000 and only 85 less than 100000.

Links

Table of n, a(n) for n=1..35.

Crossrefs

Cf. A096676, A144326

Sequence in context: A217500 A142451 A083980 * A107955 A264844 A061331

Adjacent sequences: A144324 A144325 A144326 * A144328 A144329 A144330

Keyword

easy,nonn

Author

Reikku Kulon, Sep 17 2008

Status

approved