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A225675 Numbers n such that triangular(n) is representable as p*w, where p is a prime number and w is a prime power (A025475). 0
2, 7, 9, 16, 17, 18, 25, 26, 31, 53, 81, 97, 121, 127, 162, 241, 250, 256, 337, 361, 486, 577, 625, 841, 1249, 1458, 2186, 2401, 2662, 3361, 3481, 3697, 3721, 4373, 4801, 5041, 6241, 6961, 8191, 10201, 10657, 13121, 14641, 17161, 19321, 23761, 25537, 28561, 31249, 32257 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Corresponding triangular numbers are in A225674.

The subsequence of even terms begins: 2, 16, 18, 26, 162, 250, 256, 486, 1458, 2186, 2662, 39366, 48778, 65536, 410758, 715822, 1594322, 2450086, 6615898, 12872686, 13935742, 15290746, 23394166, 38930218, 41022298, 86093442, ...

LINKS

Table of n, a(n) for n=1..50.

CROSSREFS

Cf. A000040, A000217, A025475, A225674.

Sequence in context: A154789 A106352 A098017 * A185869 A020894 A165995

Adjacent sequences:  A225672 A225673 A225674 * A225676 A225677 A225678

KEYWORD

nonn

AUTHOR

Alex Ratushnyak, May 12 2013

STATUS

approved

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Last modified September 18 16:05 EDT 2020. Contains 337169 sequences. (Running on oeis4.)