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A112625 Prime numbers that cannot be expressed as a sum of 2 triangular numbers and a power of 2. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 28 05:31 EST 2022. Contains 358407 sequences. (Running on oeis4.)