A371016 - OEIS

A371016

Centered square numbers which are semiprime.

25, 85, 145, 221, 265, 365, 481, 545, 685, 841, 1405, 1513, 1985, 2245, 2813, 2965, 3281, 3785, 3961, 4141, 4705, 5305, 5513, 5941, 6161, 6385, 6613, 7081, 7813, 8065, 8321, 9113, 9385, 10805, 11101, 11401, 11705, 12013, 12961, 13285, 13945, 16021, 17113, 17861, 19405, 22261, 23113, 24865

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OFFSET

1,1

COMMENTS

All terms are odd numbers.

LINKS

Table of n, a(n) for n=1..48.

EXAMPLE

25 = 5 * 5 = (2 * 3 * 4) + 1.

85 = 5 * 17 = (2 * 6 * 7) + 1.

145 = 5 * 29 = (2 * 8 * 9) + 1.

MATHEMATICA