A112625 Prime numbers that cannot be expressed as a sum of 2 triangular numbers and a power of 2.

152539, 175573, 292147, 303337, 437527, 590137, 1115683, 1134961, 1178659, 1205707, 1281751, 1587301, 1597759, 1673209, 1853641, 1898371, 1945243, 1997617, 2139157, 2191429, 2399641, 2417533, 2638747, 2656663, 2744587

Offset

1,1

Comments

Sequence proposed by Livio Zucca on newsgroup it.hobby.enigmi. A subset of A112665.

Links

Table of n, a(n) for n=1..25.

Example

The prime 152533 is not in the sequence since it can be expressed as 152533 = T(439) + T(334) + 2^3.

Crossrefs

Cf. A112665.

Sequence in context: A248691 A086691 A244598 * A118498 A233392 A233947

Adjacent sequences: A112622 A112623 A112624 * A112626 A112627 A112628

Keyword

nonn

Author

Giovanni Resta, Jan 12 2006

Status

approved