A370795 - OEIS

A370795

Centered square numbers which are products of four distinct primes (or tetraprimes).

99905, 107185, 242905, 350285, 363805, 372385, 433381, 569245, 590785, 630565, 692665, 752765, 907205, 942565, 1026745, 1076045, 1090765, 1105585, 1227745, 1275205, 1333345, 1467185, 1526005, 1647113, 1661665, 1761565, 1810705, 1911013, 2026085, 2317705, 2395861, 2470865

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OFFSET

1,1

COMMENTS

All terms are odd.

LINKS

Table of n, a(n) for n=1..32.

FORMULA

a(n) == 1 (mod 4).

EXAMPLE

99905 = 5 * 13 * 29 * 53 = (2 * 223 * 224) + 1.

107185 = 5 * 13 * 17 * 97 = (2 * 231 * 232) + 1.