A360838 Numbers that are partial sums of both the even semiprimes and the odd semiprimes.

0, 62234, 199370, 180901724519001618, 277270022439043481854

Offset

1,2

Comments

Any subsequent terms are > 10^18. - Lucas A. Brown, Mar 15 2024

Links

Table of n, a(n) for n=1..5.

Lucas A. Brown, Python program.

Example

62234 = 4 + 6 + 10 + 14 + ... + 1226 (112 summands)
      = 9 + 15 + 21 + 25 + ... + 779 (158 summands).
199370 = 4 + 6 + 10 + 14 + ... + 2302 (190 summands)
       = 9 + 15 + 21 + 25 + ... + 1385 (284 summands).
180901724519001618 =  4 + 6 + 10 + 14 + ... + 3886621034 (95573360 summands)
                   =  9 + 15 + 21 + 25 + ... + 1665384631 (220558398 summands).
277270022439043481854
              = 4 + 6 + 10 + 14 + ... + 165267845738 (3429906990 summands)
              = 9 + 15 + 21 + 25 + ... + 68562857299 (8197644378 summands).

Prog

(Python) # See LINKS.

Crossrefs

Cf. A046315, A100484.

Sequence in context: A089009 A093791 A083488 * A181114 A242620 A203046

Adjacent sequences: A360835 A360836 A360837 * A360839 A360840 A360841

Keyword

nonn,more

Author

Zak Seidov and Robert Israel, Apr 10 2023

Extensions

a(4) from Don Reble

a(5) from Martin Ehrenstein, Apr 25 2023

Status

approved