A280406 - OEIS

A280406

Odd semiprimes that can be represented as 2p+3q, where p and q are primes, in an increasing number of ways.

15, 25, 55, 91, 115, 187, 215, 235, 335, 403, 415, 515, 535, 655, 695, 835, 955, 1115, 1195, 1393, 1405, 1555, 1895, 1963, 2095, 2155, 2335, 2395, 2615, 2815, 2995, 3235, 3295, 3635, 3935, 3985, 4295, 4415, 4435, 4735, 4855, 4915, 5095, 5515, 5815, 6415, 6835, 7135, 7195, 7415, 8035, 8135

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OFFSET

1,1

COMMENTS

It is conjectured that all terms of this sequence above 1963 are divisible by 5. Initial search to 1000000.

LINKS

Table of n, a(n) for n=1..52.

CROSSREFS

Cf. A046315, A280389.

Sequence in context: A299469 A046291 A354959 * A020302 A020202 A020300

Adjacent sequences: A280403 A280404 A280405 * A280407 A280408 A280409

KEYWORD

nonn

AUTHOR

Randy L. Ekl, Jan 02 2017

STATUS

approved